WO2023150944A1 - 切换方法、终端设备和网络设备 - Google Patents

切换方法、终端设备和网络设备 Download PDF

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Publication number
WO2023150944A1
WO2023150944A1 PCT/CN2022/075699 CN2022075699W WO2023150944A1 WO 2023150944 A1 WO2023150944 A1 WO 2023150944A1 CN 2022075699 W CN2022075699 W CN 2022075699W WO 2023150944 A1 WO2023150944 A1 WO 2023150944A1
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WIPO (PCT)
Prior art keywords
terminal device
target
network device
relay terminal
information
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PCT/CN2022/075699
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English (en)
French (fr)
Inventor
卢飞
郭雅莉
杨皓睿
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Oppo广东移动通信有限公司
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Priority to PCT/CN2022/075699 priority Critical patent/WO2023150944A1/zh
Publication of WO2023150944A1 publication Critical patent/WO2023150944A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

Definitions

  • the present application relates to the communication field, and more specifically, to a handover method, terminal equipment, network equipment, computer-readable storage medium, computer program product and computer program.
  • ProSe Proximity-based services, based on proximity services
  • U2N terminal to network
  • Relay relay
  • the candidate Relay scenario is to use a U2N relay (relay) UE (User Equipment, User Equipment) to relay data for the U2N remote (remote) UE, so that the U2N remote UE can communicate with the network side through the relay UE.
  • U2N relay relay
  • UE User Equipment
  • remote UE User Equipment
  • Embodiments of the present application provide a switching method, a terminal device, a network device, a computer-readable storage medium, a computer program product, and a computer program.
  • This embodiment of the application provides a switching method, including:
  • the source network device sends first information to the target network device; the first information is used to determine the target relay terminal device;
  • the source network device receives the second information sent by the target network device, and sends the second information to the remote terminal device; the second information is used to instruct the remote terminal device to switch to pass through the target network device.
  • the relay terminal device is connected to the target network device.
  • This embodiment of the application provides a switching method, including:
  • the target network device receives the first information sent by the source network device; the first information is used to determine the target relay terminal device;
  • the target network device sends second information to the source network device; the second information is used to instruct a remote terminal device to switch to connect to the target network device through the target relay terminal device.
  • This embodiment of the application provides a switching method, including:
  • the remote terminal device receives the second information sent by the source network device; the second information is used to instruct the remote terminal device to switch to connect to the target network device through the target relay terminal device.
  • the embodiment of this application provides a source network device, including:
  • a first communication unit configured to send first information to a target network device; the first information is used to determine a target relay terminal device; receive second information sent by the target network device, and send the second information to A remote terminal device; the second information is used to instruct the remote terminal device to switch to connect to the target network device through the target relay terminal device.
  • An embodiment of the present application provides a target network device, including:
  • the second communication unit is configured to receive the first information sent by the source network device; the first information is used to determine the target relay terminal device; send second information to the source network device; the second information is used to indicate The remote terminal device switches to connect to the target network device through the target relay terminal device.
  • An embodiment of the present application provides a remote terminal device, including:
  • the third communication unit is configured to receive second information sent by the source network device; the second information is used to instruct the remote terminal device to switch to connect to the target network device through the target relay terminal device.
  • An embodiment of the present application provides a network device, including a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory, so that the terminal device executes the above method.
  • An embodiment of the present application provides a terminal device, including a processor and a memory.
  • the memory is used to store a computer program
  • the processor is used to call and run the computer program stored in the memory, so that the terminal device executes the above method.
  • An embodiment of the present application provides a chip configured to implement the foregoing method.
  • the chip includes: a processor, configured to invoke and run a computer program from the memory, so that the device installed with the chip executes the above-mentioned method.
  • An embodiment of the present application provides a computer-readable storage medium for storing a computer program, and when the computer program is run by a device, the device is made to execute the above method.
  • An embodiment of the present application provides a computer program product, including computer program instructions, where the computer program instructions cause a computer to execute the foregoing method.
  • An embodiment of the present application provides a computer program that, when running on a computer, causes the computer to execute the above method.
  • the source network device sends the first information used to determine the target relay terminal device to the target network device.
  • the source network device receives the second information sent by the target network device
  • the network device may send the second information to the remote terminal device, so that the remote terminal device switches to establish a connection with the target network device through the target relay terminal device based on the second information.
  • the remote terminal device can be implemented to perform network device switching processing, and can avoid the remote terminal device from being unable to establish a connection with the target network device through the target relay terminal device as soon as possible during the process of network device switching. The loss of data packets, so that the business continuity of the remote terminal equipment can be guaranteed.
  • Fig. 1 is a schematic diagram of an application scenario according to an embodiment of the present application.
  • Fig. 2 is a schematic composition structure diagram according to the 5G core network.
  • Figure 3 is a schematic diagram of the system architecture according to the U2N Relay scenario.
  • Figure 4 is a schematic diagram of the Model A discovery process based on the discovery of relays in the U2N Relay scenario.
  • Figure 5 is a schematic diagram of the Model B discovery process based on the discovery of relays in the U2N Relay scenario.
  • Fig. 6 is a first schematic flowchart of a handover method according to an embodiment of the present application.
  • FIG. 7 is a second schematic flowchart of a handover method according to an embodiment of the present application.
  • FIG. 8 is a third schematic flowchart of a handover method according to an embodiment of the present application.
  • 9 to 13 are flowcharts of various examples of handover methods according to the embodiments of the present application.
  • Fig. 14 is a first schematic block diagram of a source network device according to an embodiment of the present application.
  • Fig. 15 is a second schematic block diagram of a source network device according to an embodiment of the present application.
  • Fig. 16 is a first schematic block diagram of a target network device according to an embodiment of the present application.
  • Fig. 17 is a second schematic block diagram of a target network device according to an embodiment of the present application.
  • Fig. 18 is a schematic block diagram of a remote terminal device according to another embodiment of the present application.
  • Fig. 19 is a schematic block diagram of a communication device according to an embodiment of the present application.
  • FIG. 20 is a schematic block diagram of a chip according to an embodiment of the present application.
  • Fig. 21 is a schematic block diagram of a communication system according to an embodiment of the present application.
  • the technical solution of the embodiment of the present application can be applied to various communication systems, such as: Global System of Mobile communication (Global System of Mobile communication, GSM) system, code division multiple access (Code Division Multiple Access, CDMA) system, broadband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced long term evolution (LTE-A) system , New Radio (NR) system, evolution system of NR system, LTE (LTE-based access to unlicensed spectrum, LTE-U) system on unlicensed spectrum, NR (NR-based access to unlicensed spectrum) on unlicensed spectrum unlicensed spectrum (NR-U) system, Non-Terrestrial Networks (NTN) system, Universal Mobile Telecommunications System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (Wireless Fidelity, WiFi), fifth-generation communication (5th-Generation, 5G) system or other communication systems, etc.
  • GSM Global System of Mobile
  • D2D Device to Device
  • M2M Machine to Machine
  • MTC Machine Type Communication
  • V2V Vehicle to Vehicle
  • V2X Vehicle to everything
  • the communication system in the embodiment of the present application may be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, may also be applied to a dual connectivity (Dual Connectivity, DC) scenario, and may also be applied to an independent ( Standalone, SA) network deployment scene.
  • Carrier Aggregation, CA Carrier Aggregation
  • DC Dual Connectivity
  • SA Standalone
  • the communication system in the embodiment of the present application can be applied to an unlicensed spectrum, where the unlicensed spectrum can also be considered as a shared spectrum; or, the communication system in the embodiment of the present application can also be applied to Licensed spectrum, where the licensed spectrum can also be considered as non-shared spectrum.
  • the embodiments of the present application describe various embodiments in conjunction with network equipment and terminal equipment, wherein the terminal equipment may also be referred to as user equipment (User Equipment, UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.
  • user equipment User Equipment, UE
  • access terminal user unit
  • user station mobile station
  • mobile station mobile station
  • remote station remote terminal
  • mobile device user terminal
  • terminal wireless communication device
  • wireless communication device user agent or user device
  • the terminal device can be a station (STAION, ST) in the WLAN, a cellular phone, a cordless phone, a Session Initiation Protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital processing (Personal Digital Assistant, PDA) devices, handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, next-generation communication systems such as terminal devices in NR networks, or future Terminal equipment in the evolved public land mobile network (Public Land Mobile Network, PLMN) network, etc.
  • STAION, ST Session Initiation Protocol
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • the terminal device can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as aircraft, balloons and satellites) superior).
  • the terminal device may be a mobile phone (Mobile Phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (Virtual Reality, VR) terminal device, an augmented reality (Augmented Reality, AR) terminal Equipment, wireless terminal equipment in industrial control, wireless terminal equipment in self driving, wireless terminal equipment in remote medical, wireless terminal equipment in smart grid , wireless terminal equipment in transportation safety, wireless terminal equipment in smart city, or wireless terminal equipment in smart home.
  • a virtual reality (Virtual Reality, VR) terminal device an augmented reality (Augmented Reality, AR) terminal Equipment
  • wireless terminal equipment in industrial control wireless terminal equipment in self driving
  • wireless terminal equipment in remote medical wireless terminal equipment in smart grid
  • wireless terminal equipment in transportation safety wireless terminal equipment in smart city, or wireless terminal equipment in smart home.
  • the terminal device may also be a wearable device.
  • Wearable devices can also be called wearable smart devices, which is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not only a hardware device, but also achieve powerful functions through software support, data interaction, and cloud interaction.
  • Generalized wearable smart devices include full-featured, large-sized, complete or partial functions without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application functions, and need to cooperate with other devices such as smart phones Use, such as various smart bracelets and smart jewelry for physical sign monitoring.
  • the network device may be a device for communicating with the mobile device, and the network device may be an access point (Access Point, AP) in WLAN, a base station (Base Transceiver Station, BTS) in GSM or CDMA , or a base station (NodeB, NB) in WCDMA, or an evolved base station (Evolutional Node B, eNB or eNodeB) in LTE, or a relay station or access point, or a vehicle-mounted device, a wearable device, and an NR network
  • BTS Base Transceiver Station
  • NodeB, NB base station
  • Evolutional Node B, eNB or eNodeB evolved base station
  • LTE Long Term Evolutional Node B, eNB or eNodeB
  • gNB network equipment in the network or the network equipment in the future evolved PLMN network or the network equipment in the NTN network, etc.
  • the network device may have a mobile feature, for example, the network device may be a mobile device.
  • the network equipment may be a satellite or a balloon station.
  • the satellite can be a low earth orbit (low earth orbit, LEO) satellite, a medium earth orbit (medium earth orbit, MEO) satellite, a geosynchronous earth orbit (geosynchronous earth orbit, GEO) satellite, a high elliptical orbit (High Elliptical Orbit, HEO) satellite. ) Satellite etc.
  • the network device may also be a base station installed on land, water, and other locations.
  • the network device may provide services for a cell, and the terminal device communicates with the network device through the transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell, and the cell may be a network device ( For example, a cell corresponding to a base station), the cell may belong to a macro base station, or may belong to a base station corresponding to a small cell (Small cell), and the small cell here may include: a metro cell (Metro cell), a micro cell (Micro cell), a pico cell ( Pico cell), Femto cell, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.
  • the transmission resources for example, frequency domain resources, or spectrum resources
  • the cell may be a network device (
  • the cell may belong to a macro base station, or may belong to a base station corresponding to a small cell (Small cell)
  • the small cell here may include: a metro cell (Metro cell), a micro cell (Micro
  • FIG. 1 exemplarily shows a communication system 100 .
  • the communication system includes a network device 110 and two terminal devices 120 .
  • the communication system 100 may include multiple network devices 110, and each network device 110 may include other numbers of terminal devices 120 within the coverage area, which is not limited in this embodiment of the present application.
  • the communication system 100 may also include other network entities such as a mobility management entity (Mobility Management Entity, MME), an access and mobility management function (Access and Mobility Management Function, AMF), etc.
  • MME Mobility Management Entity
  • AMF Access and Mobility Management Function
  • the network equipment may further include access network equipment and core network equipment. That is, the wireless communication system also includes multiple core networks for communicating with access network devices.
  • the access network device may be a long-term evolution (long-term evolution, LTE) system, a next-generation (mobile communication system) (next radio, NR) system or an authorized auxiliary access long-term evolution (LAA- Evolved base station (evolutional node B, abbreviated as eNB or e-NodeB) macro base station, micro base station (also called “small base station”), pico base station, access point (access point, AP), Transmission point (transmission point, TP) or new generation base station (new generation Node B, gNodeB), etc.
  • LTE long-term evolution
  • NR next-generation
  • LAA- Evolved base station evolutional node B, abbreviated as eNB or e-NodeB
  • eNB next-generation
  • NR next-generation
  • a device with a communication function in the network/system in the embodiment of the present application may be referred to as a communication device.
  • the communication equipment may include network equipment and terminal equipment with communication functions. It may include other devices in the communication system, such as network controllers, mobility management entities and other network entities, which are not limited in this embodiment of the present application.
  • each node can be called a network function (NF, Network Function).
  • the composition structure of 5GC can refer to Figure 2, where the names and functions of each NF include: NSSF (Network Slice Selection Function, Network Function) Slice Selection Function) is mainly used for the management of information related to network slices, such as responsible for selecting network slices for terminal devices; AUSF (Authentication Server Function, Authentication Server Function) is used to complete the identity authentication function of user access; UDM (Unified Data Management, Unified Data Management) is used to manage and store subscription data and authentication data; AMF (Access and Mobility Management Function, Access and Mobility Management Function) is used to complete mobility management, security anchor point and security context management, etc.; SMF (Session Management Function, Session Management Function) is used to complete session management, UE IP address allocation and management, etc.; PCF (Policy Control Function, Policy Control Function) is used to support a unified policy framework and provide policy rules; AF (Application Function, APP Function) is used for external application servers; UPF (Network Slice Selection
  • AMF and NSSF in 5GC perform data transmission through interface N22; AMF performs data transmission with SMF through interface N11; AMF performs data transmission with AUSF through N12; AMF and UDM perform data transmission through N8 interface Transmission: data transmission between SMF and UPF through N4 interface, data transmission between UPF and RAN through N3 interface, data transmission between UPF and data network through N6 interface, etc.; and between UE and AMF through interface N1 Perform data transmission; perform data transmission between UE and RAN through Uu interface; perform data transmission between RAN and AMF through N2 interface, and perform data transmission between RAN and UPF through N3 interface. It should be understood that the above only describes the interfaces between some nodes, and other interfaces between other nodes of
  • NCIS Network Controlled Interactive Services, Network Controlled Interactive Services
  • NCIS services are mainly aimed at applications such as AR/VR and games, and have high requirements on service quality such as speed, delay, packet loss rate, and high-speed codec.
  • service quality such as speed, delay, packet loss rate, and high-speed codec.
  • the rate needs to reach 10Gbps, and the packet loss rate should not exceed 10E-4.
  • the session established for the NCIS service is an NCIS session, and UEs in the same NCIS session can be considered to form an NCIS group, for example, teaming up in a game.
  • the 5G ProSe (Proximity Service) topic is used to design the short-distance service communication scheme.
  • ProSe includes NCIS.
  • One of the important scenarios of Prose is the UE-to-network (U2N, user equipment to network) relay scenario.
  • U2N Relay scenario a U2N relay (relay) UE (hereinafter referred to as relay UE or relay UE) relays and transmits data for a U2N remote (remote) UE (hereinafter referred to as remote UE), so that the remote UE Can communicate with the network.
  • the system architecture diagram of the U2N Relay scenario is shown in Figure 3.
  • a PC5 link is established between the remote UE and the relay UE, and then the relay UE establishes a connection with the NG-RAN (Next Generation Radio Access Network).
  • the 5GC node of the remote UE and the 5GC node of the relay UE perform data transmission.
  • the 5GC node of the remote UE includes at least the AMF of the remote UE, the SMF of the remote UE, the UPF of the remote UE, and the Data Network (Data Network) shown in Figure 3;
  • the 5GC node of the relay UE includes at least the The AMF of the relay UE, the SMF of the relay UE, the UPF of the relay UE, and the data network (Data Network) are shown in 3; in addition, data transmission is performed between the relay UE and the NG-RAN through the Uu interface, and each 5GC The communication interface of the node is the same as that described in FIG. 2 above, and will not be repeated here.
  • Relay discovery can have the following methods: Model A ( Figure 4) discovery process or model B ( Figure 5) discovery process. Among them, the Model A discovery process can be shown in Figure 4.
  • the relay UE (UE1 in Figure 4) sends an announcement (announcement) message, and the RSC (in the middle) that the relay UE can provide relay services is actively broadcast through the announcement message.
  • the remote UE (such as UE2, UE3, UE4 and UE5 in Figure 4) can select a suitable relay UE according to the RSC contained in the announcement message of each relay UE received.
  • the discovery process of model B can be shown in Figure 5, the remote UE (UE1 in Figure 5, the UE1 can also be called “discoverer (discoverer)") sends a Solicitation (request) message, the Solicitation (request) message Contains the RSC required by the remote UE itself; if there are relay UEs around the remote UE that can support RSC (such as UE2 and UE3 in Figure 5), the relay UE sends a response (response) message to the remote UE ; The remote UE can select a suitable relay UE from the relay UEs sending the response (response) message.
  • the announcement message also needs to include the serving cell (serving cell) ID (identification) of the relay UE; in L2 relay discovery-model B, the response message also needs to include Including the serving cell (serving cell) ID (identification) of the relay UE.
  • intra-gNB i.e., intra-base station
  • the source base station needs to select the destination base station (or target base station) for handover.
  • the inter-gNB ie, between base stations handover scenarios of the remote UE have not been studied yet. Therefore, it is necessary to provide a way to realize the handover between base stations in the U2N Relay scenario, so as to ensure the service continuity of the remote UE, and thus ensure the user experience.
  • the "indication" mentioned in the embodiments of the present application may be a direct indication, may also be an indirect indication, and may also mean that there is an association relationship.
  • a indicates B which can mean that A directly indicates B, for example, B can be obtained through A; it can also indicate that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also indicate that there is an association between A and B relation.
  • the term "corresponding" may indicate that there is a direct or indirect correspondence between the two, or that there is an association between the two, or that it indicates and is indicated, configuration and is configuration etc.
  • Fig. 6 is a schematic flowchart of a handover method according to an embodiment of the first aspect of the present application.
  • the method can optionally be applied to the system shown in Fig. 1, but is not limited thereto.
  • the method includes at least some of the following.
  • the source network device sends first information to the target network device; the first information is used to determine the target relay terminal device;
  • the source network device receives the second information sent by the target network device, and sends the second information to the remote terminal device; the second information is used to instruct the remote terminal device to switch to the The target relay terminal device is connected to the target network device.
  • the network device may be a radio access network (RAN, Radio Access Network) device
  • the source network device may refer to a source RAN device
  • the target network device may refer to a target RAN device.
  • the RAN device may refer to a base station on the network side, such as gNB, eNB, etc.
  • the source network device may specifically be a source base station
  • the target network device may specifically be a target base station. It should be understood that the source network device is different from the target network device.
  • the remote terminal device may be called a U2N remote terminal device.
  • the serving cell where the remote terminal device is currently located may be called a source cell, and the network device where the source cell is located is the aforementioned source network device.
  • the target relay terminal device may be called a target U2N relay terminal device.
  • the target relay terminal device may be a relay terminal device in a target cell to which the remote terminal device is to be handed over; wherein, the network device where the target cell is located is the aforementioned target network device.
  • the method may further include: the source network device receiving the measurement report sent by the remote terminal device.
  • the remote terminal device may be directly connected to the source network device, that is, the data connection between the remote terminal device and the source network device is directly performed through the Uu interface.
  • transmission correspondingly, the source network device receiving the measurement report sent by the remote terminal device may be: the source network device receives the measurement report directly sent by the remote terminal device through the Uu interface.
  • the Uu interface is a 5G system, an air interface of an E-UTRAN (Evolution-Universal Mobile Telecommunications) system Universal Mobile Telecommunications System (UMTS, Universal Mobile Telecommunications System).
  • the remote terminal device and the source network device are connected (or data transmitted) through the source relay terminal device; correspondingly, the source network device receives the remote terminal device
  • the measurement report sent may be: the source network device receives the measurement report sent by the remote terminal device through the source relay terminal device.
  • the connection between the remote terminal device and the source relay terminal device may specifically be a PC5 connection; data transmission may be performed between the source relay terminal device and the source network device through a Uu interface.
  • the measurement report may include at least one of the following: the identity of the candidate relay terminal device, the signal strength of the candidate relay terminal device, and the candidate cell to which the candidate relay terminal device belongs the identifier of the candidate relay terminal device, and the signal strength of the candidate cell to which the candidate relay terminal device belongs.
  • the number of the candidate relay terminal devices in the measurement report may be one or more, which is not limited in this embodiment.
  • the identifier of the candidate relay terminal device may specifically refer to the identifier of each candidate relay terminal device among all candidate relay terminal devices.
  • the identifier of any candidate relay terminal device may specifically be the ID of the candidate relay terminal device.
  • the ID of the candidate relay terminal device can be Temporary Mobile Subscriber Identity (TMSI, Temporary Mobile Subscriber Identity), International Mobile Subscriber Identity (IMSI, International Mobile Subscriber Identity), I-RNTI (Inactive Radio Network Temporary Identifier, non-activated wireless network temporary identifier) to represent any one of them.
  • TMSI Temporary Mobile Subscriber Identity
  • IMSI International Mobile Subscriber Identity
  • I-RNTI Inactive Radio Network Temporary Identifier, non-activated wireless network temporary identifier
  • the signal strength of the candidate relay terminal device in the measurement report may specifically refer to the signal strength of each candidate relay terminal device in all candidate relay terminal devices.
  • the signal strength of any candidate relay terminal device may specifically refer to the signal reception strength of the candidate relay terminal device measured by the remote terminal device.
  • the identifier of the candidate cell to which the candidate relay terminal device belongs in the measurement report may specifically refer to the identifier of the candidate cell to which each candidate relay terminal device belongs to among all candidate relay terminal devices, for example, it may indicate is the ID of the candidate cell to which each candidate relay terminal device belongs.
  • the signal strength of the candidate cell to which the candidate relay terminal device belongs in the measurement report may be obtained by the remote terminal device performing legacy (traditional) Uu interface measurement.
  • the measurement report may include all the above contents, that is, a measurement report may include the identifier of the candidate relay terminal device, the signal strength of the candidate relay terminal device, the candidate relay terminal device The identifier of the candidate cell to which the device belongs, and the signal strength of the candidate cell to which the candidate relay terminal device belongs.
  • the measurement report may include the above-mentioned part of the content.
  • a measurement report may include: the identity of the candidate relay terminal device, the identity of the candidate cell to which the candidate relay terminal device belongs; or, a measurement The report may include: the identifier of the candidate relay terminal device, and the signal strength of the candidate relay terminal device. This is not an exhaustive list of what it may include.
  • the source network device may process it in the following three ways, respectively:
  • the source network device determines the target cell from candidate cells based on the measurement report
  • the source network device determines a candidate relay terminal device in the target cell based on the measurement report, and determines the target relay terminal device that meets a preset condition from the candidate relay terminal devices in the target cell ;
  • the preset condition includes at least one of the following: minimum load and maximum signal strength.
  • the source network device determining the target cell from the candidate cells based on the measurement report may include: the source network device extracting the signal strength of the candidate cell to which the candidate relay terminal device belongs from the measurement report , selecting a candidate cell with the highest signal strength from the candidate cells as the target cell.
  • the signal strength of the candidate cell may include: RSRP (Reference Signal Receiving Power, reference signal received power) measurement result and/or RSRQ (Reference Signal Receiving Quality, reference signal received strength) measurement result.
  • the selecting a candidate cell with the highest signal strength from the candidate cells as the target cell may include: selecting a candidate cell with the largest RSRP measurement result from the candidate cells as the target cell; or Selecting a candidate cell with the largest RSRQ measurement result from the candidate cells as the target cell; or selecting a candidate cell with the largest RSRP measurement result and the largest RSRQ measurement result from the candidate cells as the target cell.
  • the source network device determines a candidate relay terminal device in the target cell based on the measurement report, and determines the target relay terminal device that meets a preset condition from the candidate relay terminal devices in the target cell processing, which may include one of the following:
  • the source network device determines a candidate relay terminal device in the target cell from all candidate relay terminal devices included in the measurement report; the source network device determines a candidate relay terminal device in the target cell Select a candidate relay terminal device with the smallest load as the target relay terminal device; here, it should also be pointed out that if there are multiple candidate relay terminal devices with the smallest load in the target cell
  • the terminal device may randomly select any candidate relay terminal device from multiple candidate relay terminal devices with the smallest load as the target relay terminal device;
  • the source network device determines a candidate relay terminal device in the target cell from all candidate relay terminal devices included in the measurement report; the source network device determines a candidate relay terminal device in the target cell based on the measurement report Select a candidate relay terminal device with the highest signal strength among the candidate relay terminal devices as the target relay terminal device; here, it should also be pointed out that if there is a signal strength the largest multiple candidate relay terminal devices, any one candidate relay terminal device may be randomly selected from the multiple candidate relay terminal devices with the largest signal strength as the target relay terminal device;
  • the source network device determines a candidate relay terminal device in the target cell from all candidate relay terminal devices included in the measurement report; the source network device determines a candidate relay terminal device in the target cell based on the measurement report Select N candidate relay terminal devices with the smallest load from the candidate relay terminal devices, and select a candidate relay terminal device with the highest signal strength from the N candidate relay terminal devices as the target relay terminal device, N is an integer greater than or equal to 1; here, it should also be pointed out that if there are multiple candidate relay terminal devices with the highest signal strength among the N candidate relay terminal devices, then the random selection of any candidate relay terminal device as the target relay terminal device;
  • the source network device determines a candidate relay terminal device in the target cell from all candidate relay terminal devices included in the measurement report; the source network device determines a candidate relay terminal device in the target cell based on the measurement report Select M candidate relay terminal devices with the highest signal strength from the candidate relay terminal devices, and select a candidate relay terminal device with the smallest load from the M candidate relay terminal devices as the target relay terminal device, M is an integer greater than or equal to 1; here, it also needs to be pointed out that, if there are multiple candidate relay terminal devices with the smallest load among the M candidate relay terminal devices, the multiple candidate relay terminal devices with the smallest load can be Randomly select any candidate relay terminal device in the device as the target relay terminal device.
  • the measurement report may include multiple candidate relay terminal devices, where the candidate cells to which different candidate relay terminal devices belong may be the same or different.
  • the candidate relay terminal device in the target cell may be a candidate relay terminal device located in the target cell among all candidate relay terminal devices in the measurement report.
  • the measurement report contains 10 candidate relay terminal devices, respectively denoted as candidate relay terminal device 1 to candidate relay terminal device 10; wherein, candidate relay terminal device 1, candidate relay terminal device Device 2 and candidate relay terminal device 3 are candidate relay terminal devices in candidate cell 1.
  • candidate relay terminal device 4 and candidate relay terminal device 5 are candidate relay terminal devices in candidate cell 2.
  • Candidate relay terminal devices Device 6 to candidate relay terminal device 10 are candidate relay terminal devices in candidate cell 3 . If the target cell is the candidate cell 2, the candidate relay terminal devices in the target cell are the aforementioned candidate relay terminal devices 4 and 5.
  • the source network device may generate the first information based on the selected target cell and the target relay terminal device in the target cell.
  • the first information includes at least one of the following: an identifier of the target cell; and an identifier of the target relay terminal device in the target cell.
  • the first information includes an identifier of the target cell and an identifier of the target relay terminal device in the target cell. That is to say, the first information includes the identity of the target cell and the identity of the target relay terminal device in the target cell.
  • the first information includes at least an identifier of the target relay terminal device in the target cell. That is to say, the first information may only include the identifier of the target relay terminal device.
  • the source network device determines the target cell from candidate cells based on the measurement report; the source network device determines the candidate relay terminal device in the target cell based on the measurement report.
  • the source network device determining the target cell from candidate cells based on the measurement report may include: the source network device based on the candidate cell to which the candidate relay terminal device belongs to contained in the measurement report. The signal strength of the cell, selecting a candidate cell with the highest signal strength from the candidate cells as the target cell.
  • the signal strength of the candidate cell may include: RSRP measurement result and/or RSRQ measurement result.
  • the selecting a candidate cell with the highest signal strength from the candidate cells as the target cell may include: selecting a candidate cell with the largest RSRP measurement result from the candidate cells as the target cell; or Selecting a candidate cell with the largest RSRQ measurement result from the candidate cells as the target cell; or selecting a candidate cell with the largest RSRP measurement result and the largest RSRQ measurement result from the candidate cells as the target cell.
  • the source network device determining the candidate relay terminal devices in the target cell based on the measurement report may include: the source network device determining the Candidate relay terminal devices in the target cell.
  • the measurement report may include multiple candidate relay terminal devices, wherein the candidate cells to which different candidate relay terminal devices belong may be the same or different.
  • the candidate relay terminal device in the target cell may be a candidate relay terminal device located in the target cell among all candidate relay terminal devices in the measurement report.
  • the measurement report contains 10 candidate relay terminal devices, respectively denoted as candidate relay terminal device 1 to candidate relay terminal device 10; wherein, candidate relay terminal device 1, candidate relay terminal device Device 2 and candidate relay terminal device 3 are candidate relay terminal devices in candidate cell 1.
  • candidate relay terminal device 4 and candidate relay terminal device 5 are candidate relay terminal devices in candidate cell 2.
  • Candidate relay terminal devices Device 6 to candidate relay terminal device 10 are candidate relay terminal devices in candidate cell 3 . If the target cell is the candidate cell 1, the candidate relay terminal devices in the target cell are the aforementioned candidate relay terminal device 1, candidate relay terminal device 2, and candidate relay terminal device 3.
  • the source network device may generate the first information based on the selected target cell and the target relay terminal device in the target cell.
  • the first information includes at least one of the following: the identity of the target cell; the identity of the candidate relay terminal device in the target cell; the signal of the candidate relay terminal device in the target cell strength.
  • the first information includes an identifier of the target cell, an identifier of the candidate relay terminal device in the target cell, and signal strength of the candidate relay terminal device in the target cell.
  • the first information includes at least an identifier of the candidate relay terminal device in the target cell. That is to say, the first information may only include the identifier of the candidate relay terminal device.
  • the first information includes the identifier of the candidate relay terminal device in the target cell, and the signal strength of the candidate relay terminal device in the target cell. That is to say, the first information may only include the identifier of the candidate relay terminal device and its signal strength.
  • the source network device determines the target network device where the target cell is located from the candidate cells based on the measurement report; the source network device determines the candidate relay terminal device in the target network device based on the measurement report.
  • the source network device determining the target network device where the target cell is located from the candidate cells based on the measurement report may include: the source network device based on the information contained in the measurement report that the candidate relay terminal device belongs to The signal strength of the candidate cell is selected, and a candidate cell with the highest signal strength is selected from the candidate cells as the target cell; and the network device where the target cell is located is used as the target network device.
  • the source network device selects a candidate cell with the highest signal strength from the candidate cells as the target based on the signal strength of the candidate cell to which the candidate relay terminal device belongs included in the measurement report
  • the cell processing method is the same as the first method or the second method described above, and will not be repeated here.
  • the source network device determining a candidate relay terminal device in the target network device based on the measurement report may include: the source network device determining all serving cells in the target network device; the source network device From all candidate relay terminal devices included in the measurement report, determine candidate relay terminal devices in all serving cells of the target network device.
  • the measurement report may include multiple candidate relay terminal devices, wherein the candidate cells to which different candidate relay terminal devices belong may be the same or different.
  • the candidate relay terminal device in the target cell may be a candidate relay terminal device located in the target cell among all candidate relay terminal devices in the measurement report.
  • the measurement report contains 10 candidate relay terminal devices, respectively denoted as candidate relay terminal device 1 to candidate relay terminal device 10; wherein, candidate relay terminal device 1, candidate relay terminal device Device 2 and candidate relay terminal device 3 are candidate relay terminal devices in candidate cell 1.
  • candidate relay terminal device 4 and candidate relay terminal device 5 are candidate relay terminal devices in candidate cell 2.
  • Candidate relay terminal devices Device 6 to candidate relay terminal device 10 are candidate relay terminal devices in candidate cell 3 .
  • candidate relay terminal devices in candidate cell 1 and candidate cell 2 are the aforementioned candidate relay terminal device 1, candidate relay terminal device 2, candidate relay terminal device 3, candidate relay terminal device 4, and candidate relay terminal device 5 .
  • the source network device may generate the first information based on the selected target cell and the target relay terminal device in the target cell.
  • the first information includes at least one of the following: the identity of the target network device; the identity of the candidate relay terminal device in the target network device; the identity of the candidate relay terminal device in the target network device signal strength.
  • the first information includes the identity of the target network device, the signal strength of the candidate relay terminal device in the target network device, and the candidate relay terminal device in the target network device logo.
  • the first information includes at least an identifier of the candidate relay terminal device in the target network device. That is to say, the first information may only include the identifier of the candidate relay terminal device.
  • the first information includes identifiers of candidate relay terminal devices in the target network device, and signal strengths of candidate relay terminal devices in the target network device. That is to say, the first information may only include the identifier of the candidate relay terminal device and its signal strength.
  • the foregoing S610 may be performed, that is, the source network device sends the first information to the target network device.
  • the source network device is directly connected to the target network device through an Xn interface; correspondingly, the source network device sends the first information to the target network device, which may include: the source The network device directly sends the first information to the target network device through an Xn interface with the target network device.
  • the first information may be carried in a handover request message.
  • the Xn interface may be a network interface between NG-RAN nodes (such as gNB or ng-eNB).
  • the handover request message may also carry other content.
  • it may include: handover reason, UE context information, RRC context information, etc., which are not exhaustive here.
  • the source network device and the target network device perform data transmission through a core network device; correspondingly, the source network device sends the first information to the target network device, which may include: the source network device The device sends the first information to the target network device through a core network device.
  • the source network device sends the first information to the target network device through the core network device, which may specifically refer to: the source network device sends a handover required (Handover Required) message carrying the first information to Source AMF; the source AMF sends a Namf_Communication_CreateUEContext Request (namf_communication_create UE context request) carrying the first information to the target AMF; the target AMF sends a handover request (Handover Request) message carrying the first information to the target network device .
  • a handover required (Handover Required) message carrying the first information to Source AMF
  • the source AMF sends a Namf_Communication_CreateUEContext Request (namf_communication_create UE context request) carrying the first information to the target AMF
  • the target AMF sends a handover request (Handover Request) message carrying the first information to the target network device .
  • the processing of the core network device may also include: the target AMF sends an Nsmf_PDU Session_UpdateSMContext Request to the SMF; the SMF selects the UPF ( UPF Selection); SMF sends N4 session modification request (N4 Session Modification Request) to PSA (PDU session anchor, PDU session anchor point) UPF; PSA UPF sends N4 session modification response (N4 Session Modification Response) to SMF; SMF sends target UPF Send N4 Session Establishment Request (N4 Session Establishment Request); target UPF sends N4 Session Establishment Response (N4 Session Establishment Response) to SMF; SMF sends Nsmf_PDU Session_UpdateSMContext Response to target AMF; PDU switching response management between target AMF and SMF (PDU Handover Response supervision).
  • the Handover Required (Handover Required) message may also carry other content, for example, may include: target (target) TAI (tracking area identity, tracking area identity), handover reason, UE Context information, RRC context information, etc. are not exhaustive here.
  • S620 may be executed, that is, the source network device receives the second information sent by the target network device, and sends the second information to the remote terminal device .
  • the source network device receives the second information sent by the target network device:
  • the source network device is directly connected to the target network device through an Xn interface; correspondingly, the source network device receives the second information sent by the target network device, which may include: the The source network device receives the second information sent by the target network device through the Xn interface, and the second information may be carried in a handover request confirmation message.
  • the Xn interface may be a network interface between NG-RAN nodes (such as gNB or ng-eNB).
  • NG-RAN nodes such as gNB or ng-eNB.
  • the source network device and the target network device perform data transmission through a core network device; correspondingly, the source network device receives the second information sent by the target network device, which may include : The source network device receives the second information sent by the target network device through the core network device.
  • the source network device receives the second information sent by the target network device through the core network device, which may specifically include:
  • the target network device sends a Handover Request Acknowledge (Handover Request Acknowledge) message carrying the second information to the target AMF; the target AMF sends a Namf_Communication_CreateUEContext Response (namf_communication_create UE context response) carrying the second information to the source AMF; the source AMF Sending a handover command carrying the second information to the source network device.
  • a Handover Request Acknowledge Handover Request Acknowledge
  • the target AMF sends a Namf_Communication_CreateUEContext Response (namf_communication_create UE context response) carrying the second information to the source AMF
  • the source AMF Sending a handover command carrying the second information to the source network device.
  • the specific processing of the core network device may also include: the target AMF sends the Nsmf_PDUSession_UpdateSMContext Request (nsmf-PDU session Update SM content request); SMF sends N4 session modification request to target UPF; target UPF sends N4 session modification response to SMF; SMF sends N4 session modification request to source UPF; source UPF sends N4 session modification response to SMF; SMF sends N4 session modification response to target AMF Send Nsmf_PDUSession_UpdateSMContext Response (nsmf-PDU session update SM context response).
  • Scenario 1 There may be a direct connection between the remote terminal device and the source network device, that is, data transmission is directly performed between the remote terminal device and the source network device through a Uu interface.
  • the sending the second information to the remote terminal device may specifically be: the source network device sends the second information to the remote terminal device through a Uu interface.
  • the second information may be carried by an RRC (Radio Resource Control, Radio Resource Control) reconfiguration message.
  • the source network device may release the connection with the remote terminal device.
  • the remote terminal device is connected (or data transmitted) to the source network device through the source relay terminal device.
  • the connection between the remote terminal device and the source relay terminal device may specifically be a PC5 connection; data transmission may be performed between the source relay terminal device and the source network device through a Uu interface.
  • the sending the second information to the remote terminal device may specifically be: the source network device sends the second information to the remote terminal device through the source relay terminal device.
  • the second information may be carried by an RRC (Radio Resource Control, Radio Resource Control) reconfiguration message.
  • the source network device may further include: the source network device sending third information to the source relay terminal device ;
  • the third information is used to instruct the source relay terminal device to release the connection with the remote terminal device.
  • the source relay terminal device may release the connection with the remote terminal device.
  • the third information may be carried by an RRC reconfiguration message. After the aforementioned process of sending the third information to the remote terminal device is completed, the source network device may release the connection with the remote terminal device.
  • the second information may include the identity of the target relay terminal device; in addition, the second information may also include the identity of the target cell.
  • the second information may specifically be a handover command, or the second information may specifically be a handover command carried in an RRC reconfiguration message.
  • the source network device sends the first information for determining the target relay terminal device to the target network device, and when the source network device receives the second information sent by the target network device, the source network device The device may send the second information to the remote terminal device, so that the remote terminal device switches to establish a connection with the target network device through the target relay terminal device based on the second information.
  • the remote terminal device can be implemented to perform network device switching processing, and can avoid the remote terminal device from being unable to establish a connection with the target network device through the target relay terminal device as soon as possible during the process of network device switching. The loss of data packets, so that the business continuity of the remote terminal equipment can be guaranteed.
  • Fig. 7 is a schematic flowchart of a handover method according to an embodiment of the second aspect of the present application.
  • the method can optionally be applied to the system shown in Fig. 1, but is not limited thereto.
  • the method includes at least some of the following.
  • the target network device receives first information sent by the source network device; the first information is used to determine the target relay terminal device;
  • the target network device sends second information to the source network device; the second information is used to instruct a remote terminal device to switch to connect to the target network device through the target relay terminal device.
  • the network device may be a radio access network (RAN, Radio Access Network) device
  • the source network device may refer to a source RAN device
  • the target network device may refer to a target RAN device.
  • the RAN device may refer to a base station on the network side, such as gNB, eNB, etc.
  • the source network device may specifically be a source base station
  • the target network device may specifically be a target base station. It should be understood that the source network device is different from the target network device.
  • the remote terminal device may be called a U2N remote terminal device.
  • the serving cell where the remote terminal device is currently located may be called a source cell, and the network device where the source cell is located is the aforementioned source network device.
  • the target relay terminal device may be called a target U2N relay terminal device.
  • the target relay terminal device may be a relay terminal device in a target cell to which the remote terminal device is to be handed over; wherein, the network device where the target cell is located is the aforementioned target network device.
  • the target network device receives the first information sent by the source network device, which may have the following scenarios:
  • the target network device is directly connected to the source network device through an Xn interface; correspondingly, the target network device receiving the first information sent by the source network device may include: the target network device via The Xn interface receives the first information sent by the source network device.
  • the Xn interface may be a network interface between NG-RAN nodes (such as gNB or ng-eNB).
  • the first information may be carried in a handover request message. It should be understood that, in addition to the first information above, the handover request message may also carry other content. For example, it may include: handover reason, UE context information, RRC context information, etc., which are not exhaustive here.
  • the target network device and the source network device perform data transmission through a core network device; correspondingly, the target network device receives the first information sent by the source network device, which may include: the target network device The network device receives the first information sent by the source network device through the core network device.
  • the target network device receives the first information sent by the source network device through the core network device, which may specifically refer to: the source network device sends a handover required (Handover Required) message carrying the first information To the source AMF; the source AMF sends a Namf_Communication_CreateUEContext Request (namf_communication_create UE context request) carrying the first information to the target AMF; the target network device receives the handover request message carrying the first information sent by the target AMF.
  • the source network device sends a handover required (Handover Required) message carrying the first information To the source AMF
  • the source AMF sends a Namf_Communication_CreateUEContext Request (namf_communication_create UE context request) carrying the first information to the target AMF
  • the target network device receives the handover request message carrying the first information sent by the target AMF.
  • the processing of the core network device may also include: the target AMF sends a Nsmf_PDU Session_UpdateSMContext Request to the SMF; the SMF selects a UPF (UPF Selection) ;SMF sends N4 session modification request (N4 Session Modification Request) to PSA (PDU session anchor, PDU session anchor point) UPF; PSA UPF sends N4 session modification response (N4 Session Modification Response) to SMF; SMF sends N4 session to target UPF Establishment request (N4 Session Establishment Request); target UPF sends N4 session establishment response (N4 Session Establishment Response) to SMF; SMF sends Nsmf_PDU Session_UpdateSMContext Response to target AMF; PDU handover response management (PDU Handover Response supervision) between target AMF and SMF ).
  • UPF UPF
  • SMF selects a UPF (UPF Selection)
  • SMF sends N4 session modification request (N4 Session Modification
  • the Handover Required (Handover Required) message may also carry other content, for example, may include: target (target) TAI (tracking area identity, tracking area identity), handover reason, UE Context information, RRC context information, etc. are not exhaustive here.
  • the target network device may determine a target relay terminal device based on the first information. Specifically, when the content contained in the first information is different, the target network device determines the target relay terminal device based on the first information in a different processing manner, respectively:
  • the first information includes at least one of the following: an identifier of a target cell; an identifier of the target relay terminal device in the target cell.
  • the first information includes an identifier of the target cell and an identifier of the target relay terminal device in the target cell. That is to say, the first information includes the identity of the target cell and the identity of the target relay terminal device in the target cell.
  • the first information includes at least an identifier of the target relay terminal device in the target cell. That is to say, the first information may only include the identifier of the target relay terminal device.
  • the target network device may determine the target relay terminal device based on the first information. Specifically, the target network device may directly obtain the identifier of the target relay terminal device from the first information, and determine the target relay terminal device based on the identifier of the target relay terminal device.
  • the first information further includes the identity of the target cell
  • it may further include: the target network device determining the target relay terminal device based on the identity of the target cell contained in the first information the target area to which it belongs.
  • the method may further include: the target network device determining the target cell to which the target relay terminal device belongs based on the identity of the target relay terminal device.
  • the first information includes at least one of the following: the identity of the target cell; the identity of the candidate relay terminal device in the target cell; the signal strength of the candidate relay terminal device in the target cell.
  • the first information includes an identifier of the target cell, an identifier of the candidate relay terminal device in the target cell, and signal strength of the candidate relay terminal device in the target cell.
  • the first information includes at least an identifier of the candidate relay terminal device in the target cell. That is to say, the first information may only include the identifier of the candidate relay terminal device.
  • the first information includes the identifier of the candidate relay terminal device in the target cell, and the signal strength of the candidate relay terminal device in the target cell. That is to say, the first information may only include the identifier of the candidate relay terminal device and its signal strength.
  • the target network device determines a candidate relay terminal device in the target cell based on the first information; and determines the target relay terminal device satisfying a preset condition from the candidate relay terminal devices in the target cell ;
  • the preset condition includes at least one of the following: minimum load and maximum signal strength.
  • the target network device determines the candidate relay terminal device in the target cell based on the first information. Specifically, the target network device determines the target relay terminal device based on the target cell identifier contained in the first information. A cell, determining the candidate relay terminal device based on the identifier of the candidate relay terminal device in the target cell included in the first information.
  • the process of determining the target relay terminal device satisfying the preset condition from the candidate relay terminal devices in the target cell may include one of the following:
  • the source network device selects a candidate relay terminal device with the smallest load from the candidate relay terminal devices in the target cell as the target relay terminal device; here, it should also be pointed out that if the target If there are multiple candidate relay terminal devices with the smallest load among the candidate relay terminal devices in the cell, any candidate relay terminal device may be randomly selected from the multiple candidate relay terminal devices with the smallest load as the target relay terminal device.
  • Terminal Equipment Terminal Equipment
  • the source network device selects a candidate relay terminal device with the highest signal strength from the candidate relay terminal devices in the target cell as the target relay terminal device; here, it should also be pointed out that if the If there are multiple candidate relay terminal devices with the highest signal strength among the candidate relay terminal devices in the target cell, any one candidate relay terminal device may be randomly selected from the multiple candidate relay terminal devices with the highest signal strength as the Target relay terminal equipment;
  • the source network device selects L candidate relay terminal devices with the smallest load from the candidate relay terminal devices in the target cell, and selects a candidate with the highest signal strength from the L candidate relay terminal devices.
  • the relay terminal device is used as the target relay terminal device, and L is an integer greater than or equal to 1; here, it should also be pointed out that if there are multiple candidate relay terminals with the highest signal strength among the L candidate relay terminal devices device, any one candidate relay terminal device may be randomly selected from multiple candidate relay terminal devices with the highest signal strength as the target relay terminal device;
  • the source network device selects K candidate relay terminal devices with the highest signal strength from the candidate relay terminal devices in the target cell, and selects a candidate with the smallest load from the K candidate relay terminal devices.
  • the relay terminal device is used as the target relay terminal device, and K is an integer greater than or equal to 1; here, it should also be pointed out that if there are multiple candidate relay terminal devices with the smallest load among the K candidate relay terminal devices , then any candidate relay terminal device may be randomly selected from multiple candidate relay terminal devices with the smallest load as the target relay terminal device.
  • the first information includes at least one of the following: an identifier of a target network device; an identifier of a candidate relay terminal device in the target network device; and a signal strength of a candidate relay terminal device in the target network device.
  • the first information contained in the first information includes the identifier of the target network device, the signal strength of the candidate relay terminal device in the target network device, and the The identifier of the candidate relay terminal device.
  • the first information includes at least an identifier of the candidate relay terminal device in the target network device. That is to say, the first information may only include the identifier of the candidate relay terminal device.
  • the first information includes identifiers of candidate relay terminal devices in the target network device, and signal strengths of candidate relay terminal devices in the target network device. That is to say, the first information may only include the identifier of the candidate relay terminal device and its signal strength.
  • the target network device determines a candidate relay terminal device in the target network device based on the first information; and from the candidate relay terminal devices in the target network device, determine that the target relay terminal device that satisfies a preset condition A relay terminal device; wherein, the preset condition includes at least one of the following: minimum load and maximum signal strength.
  • the target network device determines the candidate relay terminal device in the target network device based on the first information, specifically: the target network device determines the candidate relay terminal device based on the target network device identifier contained in the first information The target network device, determining the candidate relay terminal device based on the identifier of the candidate relay terminal device in the target network device included in the first information.
  • the process of determining the target relay terminal device meeting the preset condition may include one of the following:
  • the target network device selects a candidate relay terminal device with the smallest load from the candidate relay terminal devices in the target network device as the target relay terminal device; here, it should also be pointed out that if the If there are multiple candidate relay terminal devices with the smallest load among the candidate relay terminal devices in the target network device, any candidate relay terminal device may be randomly selected from the multiple candidate relay terminal devices with the smallest load as the target Relay terminal equipment;
  • the target network device selects a candidate relay terminal device with the highest signal strength from the candidate relay terminal devices in the target network device as the target relay terminal device; here, it should also be pointed out that if the If there are multiple candidate relay terminal devices with the highest signal strength among the candidate relay terminal devices in the target network device, any one candidate relay terminal device may be randomly selected from the multiple candidate relay terminal devices with the highest signal strength as The target relay terminal device;
  • the target network device selects L candidate relay terminal devices with the smallest load from the candidate relay terminal devices in the target network device, and selects a candidate with the highest signal strength from the L candidate relay terminal devices.
  • the relay terminal device is used as the target relay terminal device, L is an integer greater than or equal to 1; here, it should also be pointed out that if there are multiple candidate relays with the highest signal strength among the L candidate relay terminal devices
  • the terminal device may randomly select any candidate relay terminal device as the target relay terminal device from multiple candidate relay terminal devices with the highest signal strength;
  • the target network device selects K candidate relay terminal devices with the highest signal strength from the candidate relay terminal devices in the target network device, and selects a candidate with the smallest load from the K candidate relay terminal devices.
  • the relay terminal device is used as the target relay terminal device, K is an integer greater than or equal to 1; here, it should also be pointed out that if there are multiple candidate relay terminal devices with the smallest load among the K candidate relay terminal devices device, then any candidate relay terminal device may be randomly selected from multiple candidate relay terminal devices with the smallest load as the target relay terminal device.
  • the target network device determines the target relay terminal device
  • the cell where the target relay terminal device is located may also be used as the target cell.
  • the target network device may determine the target relay terminal device, and may also determine a target cell; furthermore, the target terminal device may generate the second information.
  • the second information includes: an identifier of the target relay terminal device; in addition, the second information may further include an identifier of the target cell. It should be understood that, before the target network device generates the second information, the following processing may also be performed based on the target relay terminal device, such as: performing resource admission in the target cell, providing access to the target relay terminal device
  • the allocation of air interface resources and service bearer resources, etc., is not exhaustive here.
  • S720 may be executed, that is, the target network device sends the second information to the source network device. Specifically:
  • the target network device is directly connected to the source network device through an Xn interface; correspondingly, the target network device sends second information to the source network device, which may include: the target The network device sends the second information to the source network device through the Xn interface, where the second information may be carried in a handover request confirmation message.
  • the Xn interface may be a network interface between NG-RAN nodes (such as gNB or ng-eNB).
  • data transmission is performed between the target network device and the source network device through a core network device; correspondingly, the target network device sends the second information to the source network device, which may include: The target network device sends the second information to the target network device through a core network device.
  • the target network device sends the second information to the target network device through the core network device, which may specifically include: the target network device sends a Handover Request Acknowledge (Handover Request Acknowledge) carrying the second information to the target AMF message; the target AMF sends Namf_Communication_CreateUEContext Response (namf_communication_create UE context response information) carrying the second information to the source AMF; the source AMF sends a handover command carrying the second information to the source network device.
  • a Handover Request Acknowledge Handover Request Acknowledge
  • Namf_Communication_CreateUEContext Response namf_communication_create UE context response information
  • the specific processing of the core network device may also include: the target AMF sends the Nsmf_PDUSession_UpdateSMContext Request to the SMF; the SMF sends a Nsmf_PDUSession_UpdateSMContext Request to the target UPF Send N4 session modification request; target UPF sends N4 session modification response to SMF; SMF sends N4 session modification request to source UPF; source UPF sends N4 session modification response to SMF; SMF sends Nsmf_PDU Session_UpdateSMContext Response to target AMF.
  • the method further includes: the target network device sending fourth information to the target relay terminal device; the fourth information is used to indicate that the target relay terminal device and the remote The terminal device establishes a connection.
  • the fourth information may include an identifier of the target relay terminal device, and the fourth information may be carried in an RRC reconfiguration message.
  • the process of the target network device sending the fourth information to the target relay terminal device may be performed after the target network device generates the second information and before sending the second information to the source network device or, it may be executed after the target network device sends the second information to the source network device, which is not limited in this embodiment.
  • the target relay terminal device may determine to establish a connection with the remote terminal device based on the fourth information.
  • the method may further include: the target network device receives fifth information sent by the remote terminal device through the target relay terminal device; the fifth information is used to indicate that the remote terminal device completes path switching.
  • the fifth information may be carried by an RRC reconfiguration complete message.
  • the target network device After the target network device receives the fifth information, it may determine that the remote terminal device has established a connection with the target relay terminal device, and then may communicate with the remote terminal device through the target relay terminal device The terminal device performs uplink and/or downlink data transmission.
  • the source network device sends the first information for determining the target relay terminal device to the target network device, and the target network device sends the second information to the source network device, so that the source network device can send the second information to the remote terminal device. information, and then the remote terminal device may switch to establish a connection with the target network device through the target relay terminal device based on the second information.
  • the remote terminal device can be implemented to perform network device switching processing, and can avoid the remote terminal device from being unable to establish a connection with the target network device through the target relay terminal device as soon as possible during the process of network device switching. The loss of data packets, so that the business continuity of the remote terminal equipment can be guaranteed.
  • Fig. 8 is a schematic flowchart of a handover method according to an embodiment of the third aspect of the present application.
  • the method can optionally be applied to the system shown in Fig. 1, but is not limited thereto.
  • the method includes at least some of the following.
  • the remote terminal device receives second information sent by the source network device; the second information is used to instruct the remote terminal device to switch to connect to the target network device through the target relay terminal device.
  • the network device may be a radio access network (RAN, Radio Access Network) device
  • the source network device may refer to a source RAN device
  • the target network device may refer to a target RAN device.
  • the RAN device may refer to a base station on the network side, such as gNB, eNB, etc.
  • the source network device may specifically be a source base station
  • the target network device may specifically be a target base station. It should be understood that the source network device is different from the target network device.
  • the remote terminal device may be called a U2N remote terminal device.
  • the serving cell where the remote terminal device is currently located may be called a source cell, and the network device where the source cell is located is the aforementioned source network device.
  • the target relay terminal device may be called a target U2N relay terminal device.
  • the target relay terminal device may be a relay terminal device in a target cell to which the remote terminal device is to be handed over; wherein, the network device where the target cell is located is the aforementioned target network device.
  • the method may further include: generating a measurement report by the remote terminal device.
  • the measurement report may be obtained by the remote terminal device from measuring the message sent by the candidate relay terminal device and from measuring the legacy (traditional) Uu interface.
  • the measurement report may include at least one of the following: an identifier of the candidate relay terminal device, a signal strength of the candidate relay terminal device, an identifier of a candidate cell to which the candidate relay terminal device belongs, The signal strength of the candidate cell to which the terminal device belongs.
  • the number of the candidate relay terminal devices in the measurement report may be one or more, which is not limited in this embodiment.
  • the identifier of the candidate relay terminal device may specifically refer to the identifier of each candidate relay terminal device among all candidate relay terminal devices.
  • the identifier of any candidate relay terminal device may specifically be the ID of the candidate relay terminal device.
  • the ID of the candidate relay terminal device can be Temporary Mobile Subscriber Identity (TMSI, Temporary Mobile Subscriber Identity), International Mobile Subscriber Identity (IMSI, International Mobile Subscriber Identity), I-RNTI (Inactive Radio Network Temporary Identifier, non-activated wireless network temporary identifier) to represent any one of them.
  • TMSI Temporary Mobile Subscriber Identity
  • IMSI International Mobile Subscriber Identity
  • I-RNTI Inactive Radio Network Temporary Identifier, non-activated wireless network temporary identifier
  • the candidate relay terminal device is a relay terminal device that satisfies the relay selection criteria; the relay selection criteria may at least include: the RSC meets the requirements, that is, the RSC supported by the candidate relay terminal device is the remote RSC required by end-to-end devices.
  • the remote terminal device may determine the candidate relay terminal device through a Model A discovery process or a Model B discovery process. specific:
  • the remote terminal device may select a relay terminal device whose RSC meets the requirements as the candidate relay terminal device according to the RSC contained in the received announcement message of each relay terminal device. For example, the remote terminal device may receive announcement messages from 5 relay terminal devices, and the remote terminal device obtains the RSCs supported by the 5 relay terminal devices from the announcement message; If the RSCs of three relay terminal devices among the relay terminal devices are RSCs required by the remote terminal device, then these three relay terminal devices are candidate relay terminal devices for the remote terminal device.
  • the remote terminal device sends a Solicitation (request) message, and the Solicitation (request) message includes the RSC required by the remote terminal device itself;
  • the relay terminal device of the RSC then the relay terminal device sends a response (response) message to the remote terminal device; the remote terminal device can use the relay terminal device sending the response (response) message as a candidate relay Terminal Equipment.
  • the remote terminal device sends a Solicitation (request) message, and the Solicitation (request) message includes the RSC required by the remote terminal device itself ; If there are 3 relay terminal devices that can support RSC around the remote terminal device, then these 3 relay terminal devices send a response (response) message to the remote terminal device; the remote terminal device can Take these three relay terminal devices as candidate relay terminal devices.
  • the signal strength of the candidate relay terminal device in the measurement report may specifically refer to the signal strength of each candidate relay terminal device in all candidate relay terminal devices.
  • the signal strength of any candidate relay terminal device may specifically refer to the signal reception strength of the candidate relay terminal device measured by the remote terminal device.
  • Relay discovery can have a Model A discovery process or a Model B discovery process.
  • the processing method of the reception strength of the signal of the candidate relay terminal device measured by the remote terminal device is described in conjunction with the aforementioned Model A discovery process or model B discovery process: in the Model A discovery process, the remote
  • the manner of processing the reception strength of the signal of the candidate relay terminal device measured by the end terminal device may include: the reception strength of the announcement (announcement) message sent by each candidate relay terminal device measured by the remote terminal device.
  • the remote terminal device actively sends the RSC it needs and then receives the response (response) message sent by the candidate relay terminal device.
  • the signal strength of the candidate relay terminal device can specifically refer to the remote terminal The device measures the received strength of the response message.
  • the identifier of the candidate cell to which the candidate relay terminal device belongs in the measurement report may specifically refer to the identifier of the candidate cell to which each candidate relay terminal device belongs to among all candidate relay terminal devices, for example, it may indicate is the ID of the candidate cell to which each candidate relay terminal device belongs.
  • the identifier of the candidate cell to which the candidate relay terminal device belongs may be carried in a related message sent by the candidate relay terminal device.
  • the identifier of the candidate cell to which the candidate relay terminal device belongs may be carried in the announcement message in the Model A discovery process; or, the identifier of the candidate cell to which the candidate relay terminal device belongs may be the model B discovery process Carried in the response (response) message.
  • the signal strength of the candidate cell to which the candidate relay terminal device belongs in the measurement report may be obtained by the remote terminal device performing legacy (traditional) Uu interface measurement.
  • the signal strength of the candidate cell may include: RSRP (Reference Signal Receiving Power, reference signal received power) measurement result and/or RSRQ (Reference Signal Receiving Quality, reference signal received strength) measurement result.
  • Legacy (traditional) Uu interface measurement can be performed according to the measurement configuration.
  • the measurement configuration is mainly sent by the source network device through the measConfig (measurement configuration) information element carried in the RRCConnectionReconfigurtion (RRC connection reconfiguration) message.
  • the measurement configuration includes at least one of the following: objects to be measured by the remote terminal device, a list of cells, a reporting method, a measurement identifier, event parameters, and the like.
  • the measurement report may include all the above contents, that is, a measurement report may include the identifier of the candidate relay terminal device, the signal strength of the candidate relay terminal device, the candidate relay terminal device The identifier of the candidate cell to which the device belongs, and the signal strength of the candidate cell to which the candidate relay terminal device belongs.
  • the measurement report may include the above-mentioned part of the content.
  • a measurement report may include: the identity of the candidate relay terminal device, the identity of the candidate cell to which the candidate relay terminal device belongs; or, a measurement The report may include: the identifier of the candidate relay terminal device, and the signal strength of the candidate relay terminal device. This is not an exhaustive list of what it may include.
  • the method further includes: the remote terminal device sends the measurement report to the source network device.
  • the specific manners for the remote terminal device to send the measurement report to the source network device may be different, respectively:
  • the remote terminal device may be directly connected to the source network device, that is, data transmission is directly performed between the remote terminal device and the source network device through a Uu interface; correspondingly , the remote terminal device sending the measurement report to the source network device may be: the remote terminal device directly sends the measurement report to the source network device through a Uu interface.
  • S810 may be executed, that is, the remote terminal device receives the second information sent by the source network device.
  • the remote terminal device receiving the second information sent by the source network device may specifically be: the remote terminal device receives the second information directly sent by the source network device through a Uu interface.
  • the remote terminal device is connected (or data transmitted) to the source network device through the source relay terminal device; correspondingly, the remote terminal device sends the source network device Sending the measurement report may be: the remote terminal device sends the measurement report to the source network device through the source relay terminal device.
  • the connection between the remote terminal device and the source relay terminal device may specifically be a PC5 connection; data transmission may be performed between the source relay terminal device and the source network device through a Uu interface.
  • S810 may be executed, that is, the remote terminal device receives the second information sent by the source network device.
  • the remote terminal device receiving the second information sent by the source network device may specifically be: the remote terminal device receives the second information sent by the source network device through the source relay terminal device.
  • the second information may include the identity of the target relay terminal device; in addition, the second information may also include the identity of the target cell.
  • the second information may specifically be a handover command carried in an RRC reconfiguration message.
  • the remote terminal device When the remote terminal device establishes a connection with the target relay terminal device, the remote terminal device sends fifth information to the target network device through the target relay terminal device, and the first The five information is used to indicate that the remote terminal device completes path switching.
  • the fifth information is carried by an RRC reconfiguration complete message.
  • the remote terminal device may determine the target relay terminal device based on the identity of the target relay terminal device indicated in the second information, and establish a PC5 connection with the target relay terminal device; When the terminal device successfully establishes the PC5 connection, the remote terminal device sends fifth information to the target network device through the target relay terminal device, and the fifth information is used to indicate that the remote terminal device Complete path switching.
  • the remote terminal device may perform uplink and/or downlink data transmission with the target network device through the target relay terminal device.
  • the remote terminal device can receive the second information sent by the source network device, so that the remote terminal device switches to establish a connection with the target network device through the target relay terminal device.
  • the remote terminal device can realize the switching process of the network device, and since the remote terminal device can realize the switching process between the network devices, it can further prevent the remote terminal device from being unable to The data packet loss problem caused by establishing a connection between the target relay terminal device and the target network device as soon as possible.
  • the remote terminal equipment is Remote (remote) UE (User Equipment, User Equipment), the target relay terminal equipment is the target (target) Relay (relay) UE, the candidate relay terminal equipment is the candidate Relay UE, and the source network equipment It is the source gNB, and the target network device is the target gNB as an example.
  • Remote Remote
  • UE User Equipment
  • target target
  • Relay Relay
  • the candidate relay terminal equipment is the candidate Relay UE
  • the source network equipment It is the source gNB
  • the target network device is the target gNB as an example.
  • S910 The Remote UE sends a measurement report to the source gNB.
  • the measurement report is used to report candidate Relay UE and legacy Uu measurements.
  • the candidate Relay UE reported by the Remote UE must all meet the relay (relay) selection criteria, such as the Relay service code (RSC, relay service code) meets the requirements, that is, the RSC supported by the candidate Relay UE is required by the remote terminal equipment The RSC.
  • relay relay
  • the measurement report includes at least one of the following: the ID of the candidate Relay UE, the signal strength of the candidate Relay UE, the identifier of the candidate cell to which the candidate Relay UE belongs, the The signal strength of the candidate cell.
  • the uplink and/or downlink data transmission is directly performed between the Remote UE and the source gNB (through the Uu interface).
  • the source gNB determines the target cell and the target Relay UE in the target cell based on the measurement report.
  • the source gNB determines the target cell from the candidate cells based on the measurement report; the source gNB determines the candidate Relay UE in the target cell based on the measurement report, and from the candidate Relay UE in the target cell, Determine the target Relay UE that meets a preset condition; where the preset condition includes at least one of the following: minimum load and maximum signal strength.
  • the source gNB when the source gNB decides to switch the path of the Remote UE to connect to the target gNB through the target Relay UE, the source gNB first determines the target serving cell (target serving cell), and then selects the target serving cell from the candidate Relay in the target cell. In the UE, determine the target Relay UE that meets the preset condition.
  • target serving cell target serving cell
  • the source gNB may generate first information, the first information is used to determine the target relay terminal device, and the first information includes at least one of the following: the ID of the target serving cell (target serving cell); the target cell The ID of the target Relay UE in .
  • the source gNB sends a handover request (handover request) message carrying the first information to the target gNB.
  • the first information is used to determine the target relay terminal device, and the first information includes at least one of the following: an ID of a target serving cell (target serving cell); and an ID of the target Relay UE in the target cell.
  • the handover request (handover request) message carrying the first information can be directly sent to the target gNB.
  • the target gNB sends a handover request (handover request) acknowledgment (ACK) message carrying the second information to the source gNB.
  • handover request handover request
  • ACK acknowledgment
  • the second information may include the identity of the target relay terminal device; in addition, the second information may also include the identity of the target cell.
  • the target gNB sends an RRCReconfiguration message (RRC reconfiguration message) carrying fourth information to the target Relay UE, where the fourth information is used to instruct the target Relay UE to establish a connection with the Remote UE.
  • RRC reconfiguration message RRC reconfiguration message
  • the source gNB sends an RRCReconfiguration (RRC reconfiguration) message carrying the second information to the Remote UE.
  • RRCReconfiguration RRC reconfiguration
  • S950 and S960 are executed in no particular order, and S950 may be executed first and then S960; or, S960 may be executed first and then S950; or, S950 and S960 may be executed simultaneously.
  • the Remote UE completes the path switch, and sends fifth information to the target gNB through the target Relay UE.
  • the fifth information is carried by an RRCReconfigurationComplete (RRC reconfiguration complete) message, and is used to indicate that the remote terminal device completes the path switch.
  • the data path between the Remote UE and the target gNB is switched to a non-direct connection mode.
  • the Remote UE performs uplink and/or downlink data transmission with the target gNB through the target Relay UE.
  • the source network device is the source gNB
  • the target network device is the target gNB as an example.
  • the Remote UE sends a measurement report to the source gNB through the source Relay UE.
  • the uplink and/or downlink data transmission is performed between the Remote UE and the source gNB through the source Relay UE.
  • the source gNB determines the target cell and the target Relay UE in the target cell based on the measurement report.
  • the source gNB sends a handover request (handover request) message carrying the first information to the target gNB.
  • the first information is used to determine the target relay terminal device, and the first information includes at least one of the following: an ID of a target serving cell (target serving cell); and an ID of the target Relay UE in the target cell.
  • the handover request (handover request) message carrying the first information can be directly sent to the target gNB.
  • the target gNB sends a handover request (handover request) acknowledgment (ACK) message carrying the second information to the source gNB.
  • handover request handover request
  • ACK acknowledgment
  • the second information may include the identity of the target relay terminal device; in addition, the second information may also include the identity of the target cell.
  • the target gNB sends an RRCReconfiguration message (RRC reconfiguration message) carrying fourth information to the target Relay UE, where the fourth information is used to instruct the target Relay UE to establish a connection with the Remote UE.
  • RRC reconfiguration message RRC reconfiguration message
  • the source gNB sends an RRCReconfiguration (RRC reconfiguration) message carrying the second information to the Remote UE through the source Relay UE.
  • RRCReconfiguration RRC reconfiguration
  • S1050 and S1060 are executed in no particular order, and S1050 may be executed first and then S1060; or, S1060 may be executed first and then S1050; or, S1050 and S1060 may be executed simultaneously.
  • the source gNB sends an RRCReconfiguration (RRC reconfiguration) message carrying third information to the source Relay UE; the third information is used to instruct the source relay terminal device to release the connection with the remote terminal device.
  • RRCReconfiguration RRC reconfiguration
  • S1080 The U2N Remote UE establishes a PC5 connection with the target Relay UE.
  • the Remote UE sends fifth information to the target gNB through the target Relay UE, where the fifth information is carried by an RRCReconfigurationComplete (RRC reconfiguration complete) message, and is used to indicate that the remote terminal device completes path switching.
  • RRCReconfigurationComplete RRC reconfiguration complete
  • the data path between the Remote UE and the target gNB is switched to a non-direct connection mode.
  • the Remote UE performs uplink and/or downlink data transmission with the target gNB through the target Relay UE.
  • the source network device is the source gNB
  • the target network device is the target gNB as an example.
  • S1110 The Remote UE sends a measurement report to the source gNB.
  • the uplink and/or downlink data transmission is directly performed between the Remote UE and the source gNB (through the Uu interface).
  • the source gNB determines the target cell and candidate Relay UEs in the target cell based on the measurement report.
  • the source gNB determines the target cell from candidate cells based on the measurement report; the source gNB determines the candidate Relay UE in the target cell based on the measurement report.
  • the source gNB when the source gNB decides to switch the path of the Remote UE to connect to the target gNB through the target Relay UE, the source gNB first determines the target serving cell (target serving cell), and then determines the candidate Relay in the target cell UE.
  • target serving cell target serving cell
  • the source gNB sends a handover request (handover request) message carrying the first information to the target gNB.
  • the first information is used to determine the target relay terminal device, and the first information includes at least one of the following: an ID of a target serving cell (target serving cell); an ID of a candidate Relay UE in the target cell; the The signal strength of the candidate Relay UE in the target cell.
  • the handover request (handover request) message carrying the first information can be directly sent to the target gNB.
  • the target gNB sends a handover request (handover request) acknowledgment (ACK) message carrying the second information to the source gNB.
  • handover request handover request
  • ACK acknowledgment
  • the target network device determines, from the candidate relay terminal devices in the target cell in the first information, the target relay terminal device that satisfies a preset condition; wherein the preset condition includes at least the following One: minimum load, maximum signal strength.
  • the target gNB may generate the second information based on the target relay terminal device and the target cell where it is located.
  • the second information may include the identity of the target relay terminal device; in addition, the second information may also include the identity of the target cell.
  • the target gNB sends an RRCReconfiguration message (RRC reconfiguration message) carrying fourth information to the target Relay UE, where the fourth information is used to instruct the target Relay UE to establish a connection with the Remote UE.
  • RRC reconfiguration message RRC reconfiguration message
  • the source gNB sends an RRCReconfiguration (RRC reconfiguration) message carrying the second information to the Remote UE.
  • RRCReconfiguration RRC reconfiguration
  • S1150 and S1160 are executed in no particular order, and S1150 may be executed first and then S1160; or, S1160 may be executed first and then S1150; or, S1150 and S1160 may be executed simultaneously.
  • S1170 The Remote UE establishes a PC5 connection with the target Relay UE.
  • the Remote UE sends fifth information to the target gNB through the target Relay UE, where the fifth information is carried by an RRCReconfigurationComplete (RRC reconfiguration complete) message, and is used to indicate that the remote terminal device completes path switching.
  • RRCReconfigurationComplete RRC reconfiguration complete
  • the data path between the Remote UE and the target gNB is switched to a non-direct connection mode.
  • the Remote UE performs uplink and/or downlink data transmission with the target gNB through the target Relay UE.
  • the remote terminal equipment is U2N (terminal to network, UE-to-network) Remote UE (user equipment, User Equipment), the target relay terminal equipment is the target (target) candidate Relay (relay) UE, and the candidate relay terminal
  • the device is a candidate Relay UE, the source relay terminal device is the source Relay UE, the source network device is the source gNB, and the target network device is the target gNB as an example.
  • the Remote UE sends a measurement report to the source gNB through the source Relay UE.
  • the uplink and/or downlink data transmission is performed between the Remote UE and the source gNB through the source Relay UE.
  • the source gNB determines the target cell and candidate Relay UEs in the target cell based on the measurement report.
  • the source gNB sends a handover request (handover request) message carrying the first information to the target gNB.
  • the first information is used to determine the target relay terminal device, and the first information includes at least one of the following: an ID of a target serving cell (target serving cell); an ID of a candidate Relay UE in the target cell; the The signal strength of the candidate Relay UE in the target cell.
  • the handover request (handover request) message carrying the first information can be directly sent to the target gNB.
  • the target gNB sends a handover request (handover request) acknowledgment (ACK) message carrying the second information to the source gNB.
  • handover request handover request
  • ACK acknowledgment
  • the target network device determines, from the candidate relay terminal devices in the target cell in the first information, the target relay terminal device that satisfies a preset condition; wherein the preset condition includes at least the following One: minimum load, maximum signal strength.
  • the target gNB may generate the second information based on the target relay terminal device and the target cell where it is located.
  • the second information may include the identity of the target relay terminal device; in addition, the second information may also include the identity of the target cell.
  • the target gNB sends an RRCReconfiguration message (RRC reconfiguration message) carrying fourth information to the target Relay UE, where the fourth information is used to instruct the target Relay UE to establish a connection with the Remote UE.
  • RRC reconfiguration message RRC reconfiguration message
  • the source gNB sends an RRCReconfiguration (RRC reconfiguration) message carrying the second information to the Remote UE through the source Relay UE.
  • RRCReconfiguration RRC reconfiguration
  • S1250 and S1260 are executed in no particular order, and S1250 may be executed first and then S1260; or, S1260 may be executed first and then S1250; or, S1250 and S1260 may be executed simultaneously.
  • the source gNB sends an RRCReconfiguration (RRC reconfiguration) message carrying third information to the source Relay UE; the third information is used to instruct the source relay terminal device to release the connection with the remote terminal device.
  • RRCReconfiguration RRC reconfiguration
  • S1280 The Remote UE establishes a PC5 connection with the target Relay UE.
  • S1290 The Remote UE completes the path switch, and sends fifth information to the target gNB through the target Relay UE, where the fifth information is carried by an RRCReconfigurationComplete (RRC reconfiguration complete) message, and is used to indicate that the remote terminal device completes the path switch.
  • RRCReconfigurationComplete RRC reconfiguration complete
  • the source network device is the source NG-RAN
  • the target network device is the target NG-RAN
  • the Remote UE sends a measurement report to the source NG-RAN.
  • the Remote UE performs uplink and/or downlink user plane data transmission with the core network equipment (specifically, UPF) through the source NG-RAN.
  • the core network equipment specifically, UPF
  • the source NG-RAN sends a handover required (Handover Required) message carrying the first information to the source AMF.
  • the source NG-RAN determines the target NG-RAN and the candidate Relay UE under the target NG-RAN based on the measurement report.
  • the source NG-RAN triggers a relocation decision (Decision to trigger a relocation via N2) through N2
  • the source NG-RAN sends a handover requirement (Handover Required) carrying the first information to the source AMF.
  • the first information may include: the ID of the target NG-RAN (such as the target gNB), and the ID of the candidate Relay UE under the target NG-RAN (such as the target gNB).
  • the first information may also include target TAI, etc., which are not exhaustive here.
  • the source AMF selects a target AMF (T-AMF Selection).
  • the source AMF sends first information to the target AMF, and the first information is carried by Namf_Communication_CreateUEContext Request.
  • the target AMF sends a Nsmf_PDUSession_UpdateSMContext Request to the SMF.
  • the SMF selects UPF (UPF Selection).
  • the SMF sends an N4 session modification request (N4 Session Modification Request) to the PSA UPF.
  • N4 Session Modification Request N4 Session Modification Request
  • the PSA UPF sends an N4 session modification response (N4 Session Modification Response) to the SMF.
  • N4 Session Modification Response N4 Session Modification Response
  • the SMF sends an N4 session establishment request (N4 Session Establishment Request) to the target UPF.
  • N4 Session Establishment Request N4 Session Establishment Request
  • the target UPF sends an N4 session establishment response (N4 Session Establishment Response) to the SMF.
  • N4 Session Establishment Response N4 Session Establishment Response
  • the SMF sends Nsmf_PDUSession_UpdateSMContext Response to the target AMF.
  • the target AMF sends a handover request (Handover Request) carrying the first information to the target NG-RAN.
  • the target NG-RAN determines the target Relay UE based on the first information; in addition, the target cell can also be selected.
  • the target NG-RAN may generate second information based on the target Relay UE.
  • the target NG-RAN sends fourth information to the target relay UE, where the fourth information is carried in an RRC redistribution message, and the fourth information is used to instruct the target Relay UE to establish a connection with the Remote UE.
  • the target NG-RAN sends a handover request acknowledgment (Handover Request Acknowledge) carrying the second information to the target AMF.
  • Handover Request Acknowledge a handover request acknowledgment
  • the target AMF sends a Nsmf_PDUSession_UpdateSMContext Request to the SMF.
  • the SMF sends an N4 session modification request to the target UPF.
  • the target UPF sends an N4 session modification response to the SMF.
  • the SMF sends an N4 session modification request to the source UPF.
  • the source UPF sends an N4 session modification response to the SMF.
  • the SMF sends Nsmf_PDUSession_UpdateSMContext Response to the target AMF.
  • the target AMF sends second information to the source AMF, where the second information is carried by Namf_Communication_CreateUEContext Response.
  • the source AMF sends a handover command carrying the second information to the source NG-RAN.
  • the source NG-RAN sends the second information to the Remote UE, where the second information may be carried in an RRCReconfiguration (RRC reconfiguration) message.
  • RRCReconfiguration RRC reconfiguration
  • the Remote UE establishes a PC5 connection with the target Relay UE.
  • the Remote UE sends fifth information to the target NG-RAN through the target Relay UE, where the fifth information is carried by an RRCReconfigurationComplete (RRC reconfiguration complete) message, and is used to indicate that the remote terminal device completes path switching.
  • RRCReconfigurationComplete RRC reconfiguration complete
  • Fig. 14 is a schematic block diagram of a source network device according to an embodiment of the present application.
  • the source network devices may include:
  • the first communication unit 1401 is configured to send first information to a target network device; the first information is used to determine a target relay terminal device; receive second information sent by the target network device, and send the second information to the remote terminal device; the second information is used to instruct the remote terminal device to switch to connect to the target network device through the target relay terminal device.
  • the first information includes at least one of the following:
  • An identifier of the target relay terminal device in the target cell is an identifier of the target relay terminal device in the target cell.
  • the source network device also includes:
  • the first processing unit 1402 is configured to determine the target cell from the candidate cells based on the measurement report; determine the candidate relay terminal device in the target cell based on the measurement report, and determine the candidate relay terminal device in the target cell from the The target relay terminal device that satisfies a preset condition is determined among the candidate relay terminal devices; wherein the preset condition includes at least one of the following: minimum load and maximum signal strength.
  • the first information includes at least one of the following:
  • An identifier of a candidate relay terminal device in the target cell An identifier of a candidate relay terminal device in the target cell
  • the first processing unit 1402 is configured to determine the target cell from candidate cells based on the measurement report; and determine the candidate relay terminal device in the target cell based on the measurement report.
  • the first information includes at least one of the following:
  • An identifier of a candidate relay terminal device in the target network device is an identifier of a candidate relay terminal device in the target network device
  • the first processing unit 1402 is configured to determine the target network device where the target cell is located from the candidate cells based on the measurement report; and determine the candidate relay terminal device in the target network device based on the measurement report.
  • the first communication unit 1401 is configured to send the first information to the target network device through a core network device.
  • the first communication unit is configured to receive the second information sent by the target network device through the core network device.
  • the first communication unit is configured to send the second information to the remote terminal device through the source relay terminal device.
  • the first communication unit is configured to send third information to the source relay terminal device; the third information is used to instruct the source relay terminal device to release the connection with the remote terminal device.
  • the first communication unit is configured to receive the measurement report sent by the remote terminal device.
  • the first communication unit is configured to receive the measurement report sent by the remote terminal device through the source relay terminal device.
  • the measurement report includes at least one of the following:
  • the signal strength of the candidate relay terminal device is the signal strength of the candidate relay terminal device
  • the signal strength of the candidate cell to which the candidate relay terminal device belongs is the signal strength of the candidate cell to which the candidate relay terminal device belongs.
  • the second information includes: an identifier of the target relay terminal device.
  • the source network device in this embodiment of the present application can implement the corresponding functions of the source network device in the foregoing embodiments of the first aspect, the second aspect, and the third aspect.
  • each module (submodule, unit or component, etc.) in the source network device refers to the corresponding description in the above method embodiment, and details are not repeated here.
  • the functions described by each module (submodule, unit or component, etc.) in the network device of the application embodiment can be realized by different modules (submodule, unit or component, etc.), or by the same module (submodule, unit or component, etc.) implementation.
  • Fig. 16 is a schematic block diagram of a target network device according to an embodiment of the present application.
  • the target network devices may include:
  • the second communication unit 1601 is configured to receive the first information sent by the source network device; the first information is used to determine the target relay terminal device; send second information to the source network device; the second information is used for Instructing the remote terminal device to switch to connect to the target network device through the target relay terminal device.
  • the first information includes at least one of the following:
  • An identifier of the target relay terminal device in the target cell is an identifier of the target relay terminal device in the target cell.
  • the target network device also includes:
  • the second processing unit 1602 is configured to determine the target relay terminal device based on the first information.
  • the first information includes at least one of the following:
  • An identifier of a candidate relay terminal device in the target cell An identifier of a candidate relay terminal device in the target cell
  • a second processing unit configured to determine a candidate relay terminal device in the target cell based on the first information; and determine the target relay that satisfies a preset condition from the candidate relay terminal devices in the target cell A terminal device; wherein, the preset condition includes at least one of the following: minimum load and maximum signal strength.
  • the first information includes at least one of the following:
  • An identifier of a candidate relay terminal device in the target network device is an identifier of a candidate relay terminal device in the target network device
  • the second processing unit is configured to determine a candidate relay terminal device in the target network device based on the first information; from the candidate relay terminal devices in the target network device, determine the The target relay terminal device; wherein, the preset condition includes at least one of the following: minimum load and maximum signal strength.
  • the second communication unit is configured to receive the first information sent by the source network device through a core network device.
  • the second communication unit is configured to send second information to the source network device through the core network device.
  • the second information includes: an identifier of the target relay terminal device.
  • the second communication unit is configured to send fourth information to the target relay terminal device; the fourth information is used to instruct the target relay terminal device to establish a connection with the remote terminal device.
  • the second communication unit is configured to receive, through the target relay terminal device, fifth information sent by the remote terminal device; the fifth information is used to indicate that the remote terminal device completes path switching.
  • the target network device in this embodiment of the present application can implement the corresponding functions of the target network device in the aforementioned embodiments of the first aspect, the second aspect, and the third aspect.
  • each module (submodule, unit or component, etc.) in the target network device refers to the corresponding description in the above method embodiment, and details are not repeated here.
  • the functions described by each module (submodule, unit or component, etc.) in the target network device in the embodiment of the application can be realized by different modules (submodules, units or components, etc.), or by the same Module (submodule, unit or component, etc.) implementation.
  • Fig. 18 is a schematic block diagram of a remote terminal device according to an embodiment of the present application.
  • the target network devices may include:
  • the third communication unit 1801 is configured to receive second information sent by the source network device; the second information is used to instruct the remote terminal device to switch to connect to the target network device through the target relay terminal device.
  • the third communication unit is configured to send fifth information to the target network device through the target relay terminal device when the remote terminal device establishes a connection with the target relay terminal device,
  • the fifth information is used to indicate that the remote terminal device completes path switching.
  • the third communication unit is configured to send a measurement report to the source network device.
  • the third communication unit is configured to send a measurement report to the source network device through the source relay terminal device.
  • the measurement report includes at least one of the following:
  • the third communication unit is configured to receive the second information sent by the source network device through the source relay terminal device.
  • the second information includes: an identifier of the target relay terminal device.
  • the remote terminal device may further include a third processing unit, and the third processing unit may perform processes such as generating a measurement report, analyzing the second information to determine a communication resource, etc., but not exhaustive here.
  • the remote terminal device in the embodiment of the present application can realize the corresponding functions of the remote terminal device in the foregoing embodiments of the first aspect, the second aspect, and the third aspect.
  • each module (submodule, unit or component, etc.) in the remote terminal device refers to the corresponding description in the above method embodiment, and will not repeat them here.
  • the functions described by the various modules (submodules, units or components, etc.) in the remote terminal equipment in the embodiment of the application can be realized by different modules (submodules, units or components, etc.), or by the same A module (submodule, unit or component, etc.) implementation.
  • Fig. 19 is a schematic structural diagram of a communication device 1900 according to an embodiment of the present application.
  • the communication device 1900 includes a processor 1910, and the processor 1910 can invoke and run a computer program from a memory, so that the communication device 1900 implements the method in the embodiment of the present application.
  • the communication device 1900 may further include a memory 1920 .
  • the processor 1910 may invoke and run a computer program from the memory 1920, so that the communication device 1900 implements the method in the embodiment of the present application.
  • the memory 1920 may be an independent device independent of the processor 1910 , or may be integrated in the processor 1910 .
  • the communication device 1900 may further include a transceiver 1930, and the processor 1910 may control the transceiver 1930 to communicate with other devices, specifically, to send information or data to other devices, or to receive information from other devices information or data sent.
  • the transceiver 1930 may include a transmitter and a receiver.
  • the transceiver 1930 may further include antennas, and the number of antennas may be one or more.
  • the communication device 1900 may be the network device of the embodiment of the present application, and the communication device 1900 may implement the corresponding processes implemented by the network device in each method of the embodiment of the present application. For the sake of brevity, the This will not be repeated here.
  • the communication device 1900 may be a terminal device in the embodiment of the present application, and the communication device 1900 may implement the corresponding processes implemented by the terminal device in each method of the embodiment of the present application. For the sake of brevity, the This will not be repeated here.
  • FIG. 20 is a schematic structural diagram of a chip 2000 according to an embodiment of the present application.
  • the chip 2000 includes a processor 2010, and the processor 2010 can invoke and run a computer program from a memory, so as to implement the method in the embodiment of the present application.
  • the chip 2000 may further include a memory 2020 .
  • the processor 2010 can call and run a computer program from the memory 2020, so as to implement the method executed by the terminal device or the network device in the embodiment of the present application.
  • the memory 2020 may be a separate device independent of the processor 2010 , or may be integrated in the processor 2010 .
  • the chip 2000 may further include an input interface 2030 .
  • the processor 2010 can control the input interface 2030 to communicate with other devices or chips, specifically, can obtain information or data sent by other devices or chips.
  • the chip 2000 may further include an output interface 2040 .
  • the processor 2010 can control the output interface 2040 to communicate with other devices or chips, specifically, can output information or data to other devices or chips.
  • the chip can be applied to the network device in the embodiment of the application, and the chip can implement the corresponding processes implemented by the network device in the methods of the embodiment of the application.
  • the Let me repeat for the sake of brevity, the Let me repeat.
  • the chip can be applied to the terminal device in the embodiment of the present application, and the chip can implement the corresponding process implemented by the terminal device in each method of the embodiment of the present application.
  • the Let me repeat for the sake of brevity, the Let me repeat.
  • Chips applied to network devices and terminal devices may be the same chip or different chips.
  • the chip mentioned in the embodiment of the present application may also be called a system-on-chip, a system-on-chip, a system-on-a-chip, or a system-on-a-chip.
  • the processor mentioned above can be a general-purpose processor, a digital signal processor (DSP), an off-the-shelf programmable gate array (FPGA), an application specific integrated circuit (ASIC) or Other programmable logic devices, transistor logic devices, discrete hardware components, etc.
  • DSP digital signal processor
  • FPGA off-the-shelf programmable gate array
  • ASIC application specific integrated circuit
  • the general-purpose processor mentioned above may be a microprocessor or any conventional processor or the like.
  • the aforementioned memories may be volatile memories or nonvolatile memories, or may include both volatile and nonvolatile memories.
  • the non-volatile memory can be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically programmable Erases programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM).
  • the memory in the embodiment of the present application may also be a static random access memory (static RAM, SRAM), a dynamic random access memory (dynamic RAM, DRAM), Synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection Dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is, the memory in the embodiments of the present application is intended to include, but not be limited to, these and any other suitable types of memory.
  • Fig. 21 is a schematic block diagram of a communication system 2100 according to an embodiment of the present application.
  • the communication system 2100 includes a terminal device 2110 and a network device 2120 .
  • the terminal device 2110 may be used to realize corresponding functions realized by the terminal device in the above method
  • the network device 2120 may be used to realize corresponding functions realized by the network device in the above method.
  • details are not repeated here.
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, e.g.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media.
  • the available medium may be a magnetic medium (such as a floppy disk, a hard disk, or a magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (Solid State Disk, SSD)), etc.
  • sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not be used in the embodiments of the present application.
  • the implementation process constitutes any limitation.

Abstract

本申请提供了一种切换方法、终端设备、网络设备、计算机可读存储介质、计算机程序产品以及计算机程序。其中方法包括：源网络设备向目标网络设备发送第一信息；第一信息用于确定目标中继终端设备（S610）；源网络设备接收目标网络设备发送的第二信息，将第二信息发送至远端终端设备；第二信息用于指示远端终端设备切换为通过目标中继终端设备与目标网络设备连接（S620）。

Description

切换方法、终端设备和网络设备 技术领域
本申请涉及通信领域，更具体地，涉及一种切换方法、终端设备、网络设备、计算机可读存储介质、计算机程序产品以及计算机程序。
背景技术
在3GPP(3rd Generation Partnership Project，第三代移动通信合作计划)中，使用5G(第五代移动通信技术，5th Generation Mobile Communication Technology)ProSe(Proximity-based services，基于邻近的服务)课题来进行对近距离业务通信的方案设计。ProSe中的一个重要场景就是UE-to-network(U2N，终端至网络)relay(中继)场景。候选Relay场景是通过一个U2N中继(relay)UE(用户设备，User Equipment)为U2N远端(remote)UE中继传输数据，从而使U2N remote UE可以通过中继UE与网络侧实现通信。然而，如何保证U2N remote UE的业务连续性，就成为需要解决的问题。
发明内容
本申请实施例提供一种切换方法、终端设备、网络设备、计算机可读存储介质、计算机程序产品以及计算机程序。
本申请实施例提供一种切换方法，包括：
源网络设备向目标网络设备发送第一信息；所述第一信息用于确定目标中继终端设备；
所述源网络设备接收所述目标网络设备发送的第二信息，将所述第二信息发送至远端终端设备；所述第二信息用于指示所述远端终端设备切换为通过所述目标中继终端设备与所述目标网络设备连接。
本申请实施例提供一种切换方法，包括：
目标网络设备接收源网络设备发送的第一信息；所述第一信息用于确定目标中继终端设备；
所述目标网络设备向所述源网络设备发送第二信息；所述第二信息用于指示远端终端设备切换为通过所述目标中继终端设备与所述目标网络设备连接。
本申请实施例提供一种切换方法，包括：
远端终端设备接收源网络设备发送的第二信息；所述第二信息用于指示远端终端设备切换为通过目标中继终端设备与目标网络设备连接。
本申请实施例提供一种源网络设备，包括：
第一通信单元，用于向目标网络设备发送第一信息；所述第一信息用于确定目标中继终端设备；接收所述目标网络设备发送的第二信息，将所述第二信息发送至远端终端设备；所述第二信息用于指示所述远端终端设备切换为通过所述目标中继终端设备与所述目标网络设备连接。
本申请实施例提供一种目标网络设备，包括：
第二通信单元，用于接收源网络设备发送的第一信息；所述第一信息用于确定目标中继终端设备；向所述源网络设备发送第二信息；所述第二信息用于指示远端终端设备切换为通过所述目标中继终端设备与所述目标网络设备连接。
本申请实施例提供一种远端终端设备，包括：
第三通信单元，用于接收源网络设备发送的第二信息；所述第二信息用于指示远端终端设备切换为通过目标中继终端设备与目标网络设备连接。
本申请实施例提供一种网络设备，包括处理器和存储器。该存储器用于存储计算机程序，该处理器用于调用并运行该存储器中存储的计算机程序，以使该终端设备执行上述方法。
本申请实施例提供一种终端设备，包括处理器和存储器。该存储器用于存储计算机程序，该处理器用于调用并运行该存储器中存储的计算机程序，以使该终端设备执行上述方法。
本申请实施例提供一种芯片，用于实现上述方法。
具体地，该芯片包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有该芯片的设备执行上述的方法。
本申请实施例提供一种计算机可读存储介质，用于存储计算机程序，当该计算机程序被设备运行时使得该设备执行上述方法。
本申请实施例提供一种计算机程序产品，包括计算机程序指令，该计算机程序指令使得计算机执行上述方法。
本申请实施例提供一种计算机程序，当其在计算机上运行时，使得计算机执行上述方法。
本申请实施例提供的方案，由源网络设备向目标网络设备发送用于确定目标中继终端设备的第一信 息，在源网络设备接收到目标网络设备发来的第二信息的情况下，源网络设备可以向远端终端设备发送该第二信息，以使得远端终端设备基于第二信息切换为通过目标中继终端设备与目标网络设备建立连接。这样，可以实现远端终端设备进行网络设备的切换处理，并且可以避免远端终端设备在发生网络设备的切换的过程中，由于无法尽快通过目标中继终端设备与目标网络设备建立连接所带来的数据包的丢失问题，如此就可以保证远端终端设备的业务连续性。
附图说明
图1是根据本申请实施例的应用场景的示意图。
图2是根据5G核心网的示意性组成结构图。
图3是根据U2N Relay场景的系统架构示意图。
图4是根据U2N Relay场景中发现中继的Model A发现流程示意图。
图5是根据U2N Relay场景中发现中继的Model B发现流程示意图。
图6是根据本申请一实施例的切换方法的示意性流程图一。
图7是根据本申请一实施例的切换方法的示意性流程图二。
图8是根据本申请一实施例的切换方法的示意性流程图三。
图9～图13是根据本申请实施例的切换方法的多种示例的流程图。
图14是根据本申请的一实施例的源网络设备的示意性框图一。
图15是根据本申请的一实施例的源网络设备的示意性框图二。
图16是根据本申请的一实施例的目标网络设备的示意性框图一。
图17是根据本申请的一实施例的目标网络设备的示意性框图二。
图18是根据本申请的另一实施例的远端终端设备的示意性框图。
图19是根据本申请实施例的通信设备示意性框图。
图20是根据本申请实施例的芯片的示意性框图。
图21是根据本申请实施例的通信系统的示意性框图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、先进的长期演进(Advanced long term evolution，LTE-A)系统、新无线(New Radio，NR)系统、NR系统的演进系统、非授权频谱上的LTE(LTE-based access to unlicensed spectrum，LTE-U)系统、非授权频谱上的NR(NR-based access to unlicensed spectrum，NR-U)系统、非地面通信网络(Non-Terrestrial Networks，NTN)系统、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、无线局域网(Wireless Local Area Networks，WLAN)、无线保真(Wireless Fidelity，WiFi)、第五代通信(5th-Generation，5G)系统或其他通信系统等。
通常来说，传统的通信系统支持的连接数有限，也易于实现，然而，随着通信技术的发展，移动通信系统将不仅支持传统的通信，还将支持例如，设备到设备(Device to Device，D2D)通信，机器到机器(Machine to Machine，M2M)通信，机器类型通信(Machine Type Communication，MTC)，车辆间(Vehicle to Vehicle，V2V)通信，或车联网(Vehicle to everything，V2X)通信等，本申请实施例也可以应用于这些通信系统。
在一种可能的实现方式中，本申请实施例中的通信系统可以应用于载波聚合(Carrier Aggregation，CA)场景，也可以应用于双连接(Dual Connectivity，DC)场景，还可以应用于独立(Standalone，SA)布网场景。
在一种可能的实现方式中，本申请实施例中的通信系统可以应用于非授权频谱，其中，非授权频谱也可以认为是共享频谱；或者，本申请实施例中的通信系统也可以应用于授权频谱，其中，授权频谱也可以认为是非共享频谱。
本申请实施例结合网络设备和终端设备描述了各个实施例，其中，终端设备也可以称为用户设备(User Equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置等。
终端设备可以是WLAN中的站点(STAION，ST)，可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处 理(Personal Digital Assistant，PDA)设备、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备、下一代通信系统例如NR网络中的终端设备，或者未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)网络中的终端设备等。
在本申请实施例中，终端设备可以部署在陆地上，包括室内或室外、手持、穿戴或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。
在本申请实施例中，终端设备可以是手机(Mobile Phone)、平板电脑(Pad)、带无线收发功能的电脑、虚拟现实(Virtual Reality，VR)终端设备、增强现实(Augmented Reality，AR)终端设备、工业控制(industrial control)中的无线终端设备、无人驾驶(self driving)中的无线终端设备、远程医疗(remote medical)中的无线终端设备、智能电网(smart grid)中的无线终端设备、运输安全(transportation safety)中的无线终端设备、智慧城市(smart city)中的无线终端设备或智慧家庭(smart home)中的无线终端设备等。
作为示例而非限定，在本申请实施例中，该终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
在本申请实施例中，网络设备可以是用于与移动设备通信的设备，网络设备可以是WLAN中的接入点(Access Point，AP)，GSM或CDMA中的基站(Base Transceiver Station，BTS)，也可以是WCDMA中的基站(NodeB，NB)，还可以是LTE中的演进型基站(Evolutional Node B，eNB或eNodeB)，或者中继站或接入点，或者车载设备、可穿戴设备以及NR网络中的网络设备(gNB)或者未来演进的PLMN网络中的网络设备或者NTN网络中的网络设备等。
作为示例而非限定，在本申请实施例中，网络设备可以具有移动特性，例如网络设备可以为移动的设备。可选地，网络设备可以为卫星、气球站。例如，卫星可以为低地球轨道(low earth orbit，LEO)卫星、中地球轨道(medium earth orbit，MEO)卫星、地球同步轨道(geostationary earth orbit，GEO)卫星、高椭圆轨道(High Elliptical Orbit，HEO)卫星等。可选地，网络设备还可以为设置在陆地、水域等位置的基站。
在本申请实施例中，网络设备可以为小区提供服务，终端设备通过该小区使用的传输资源(例如，频域资源，或者说，频谱资源)与网络设备进行通信，该小区可以是网络设备(例如基站)对应的小区，小区可以属于宏基站，也可以属于小小区(Small cell)对应的基站，这里的小小区可以包括：城市小区(Metro cell)、微小区(Micro cell)、微微小区(Pico cell)、毫微微小区(Femto cell)等，这些小小区具有覆盖范围小、发射功率低的特点，适用于提供高速率的数据传输服务。
图1示例性地示出了一种通信系统100。该通信系统包括一个网络设备110和两个终端设备120。在一种可能的实现方式中，该通信系统100可以包括多个网络设备110，并且每个网络设备110的覆盖范围内可以包括其它数量的终端设备120，本申请实施例对此不做限定。
在一种可能的实现方式中，该通信系统100还可以包括移动性管理实体(Mobility Management Entity，MME)、接入与移动性管理功能(Access and Mobility Management Function，AMF)等其他网络实体，本申请实施例对此不作限定。
其中，网络设备又可以包括接入网设备和核心网设备。即无线通信系统还包括用于与接入网设备进行通信的多个核心网。接入网设备可以是长期演进(long-term evolution，LTE)系统、下一代(移动通信系统)(next radio，NR)系统或者授权辅助接入长期演进(authorized auxiliary access long-term evolution，LAA-LTE)系统中的演进型基站(evolutional node B，简称可以为eNB或e-NodeB)宏基站、微基站(也称为“小基站”)、微微基站、接入站点(access point，AP)、传输站点(transmission point，TP)或新一代基站(new generation Node B，gNodeB)等。
应理解，本申请实施例中网络/系统中具有通信功能的设备可称为通信设备。以图1示出的通信系统为例，通信设备可包括具有通信功能的网络设备和终端设备，网络设备和终端设备可以为本申请实施例中的具体设备，此处不再赘述；通信设备还可包括通信系统中的其他设备，例如网络控制器、移动管理实体等其他网络实体，本申请实施例中对此不做限定。
为了便于理解本申请实施例，下面对本申请实施例所涉及到的基本流程以及基本概念进行简单说明。应理解，下文所介绍的基本流程以及基本概念并不对本申请实施例产生限定。
5GC(5G核心网)中，每个节点可以称为网络功能(NF，Network Function)，5GC的组成架构可 以参考图2，其中，各个NF的名称以及功能包括：NSSF(网络切片选择功能，Network Slice Selection Function)主要用于网络切片相关信息的管理，比如负责为终端设备选择网络切片；AUSF(认证服务器功能，Authentication Server Function)用于完成用户接入的身份认证功能；UDM(统一数据管理，Unified Data Management)用于管理和存储签约数据、鉴权数据；AMF(接入和移动性管理功能，Access and Mobility Management Function)用于完成移动性管理、安全锚点和安全上下文管理等等；SMF(会话管理功能，Session Management Function)用于完成会话管理、UE IP地址分配和管理等；PCF(策略控制功能，Policy Control Function)用于支持统一策略框架以及提供策略规则；AF(应用程序功能，APP Function)用于外部应用程序服务器；UPF(用户面功能，User Plane Function)用于复杂用户面处理，比如在无线接入网和互联网之间转发流量、报告流量使用情况、QoS(Quality of Service，服务质量)策略实施等；DN(数据网络，Data Network)即5GC外部数据网络(比如互联网等)。
另外，在5GC(5G核心网)的各个节点之间、用户设备(UE)与5GC的节点之间、UE与无线接入网(RAN，Radio Access Network)之间、以及RAN与5GC的节点之间分别通过对应的接口进行数据传输。比如图2所示：5GC中的AMF与NSSF之间通过接口N22进行数据传输；AMF通过接口N11与SMF进行数据传输；AMF通过N12与AUSF进行数据传输；AMF与UDM之间通过N8接口进行数据传输；SMF与UPF之间通过N4接口进行数据传输，UPF与RAN之间通过N3接口进行数据传输，UPF与数据网络之间通过N6接口进行数据传输等等；以及UE与AMF之间通过接口N1进行数据传输；UE与RAN之间通过Uu接口进行数据传输；RAN与AMF之间通过N2接口进行数据传输，RAN与UPF之间通过N3接口进行数据传输。应理解，以上仅进行了部分节点之间的接口的说明，图2中关于5GC其他节点之间的其他接口不做一一赘述。
随着5G应用的不断发展，NCIS(网络控制互动服务，Network Controlled Interactive Services)业务作为一个新的业务形态被引入到标准中进行相关的标准化业务。NCIS业务主要针对AR/VR、游戏等应用，对速率、时延、丢包率、高速编解码等业务质量有很高的要求。例如：对于VR游戏，需要达到10Gbps速率，丢包率不可超过10E-4。针对NCIS业务建立的会话为NCIS会话，在相同NCIS会话的UE可以认为组成一个NCIS组，例如：游戏中组队。
在3GPP R17中，使用5G ProSe(近距离业务，Proximity Service)课题来进行对近距离业务通信的方案设计。ProSe包含NCIS。Prose其中一个重要场景就是UE-to-network(U2N，用户设备至网络)relay场景。U2N Relay场景是通过一个U2N中继(relay)UE(以下简称为中继UE或relay UE)为U2N远端(remote)UE(以下简称为远端UE)中继传输数据，从而使远端UE可以与网络实现通信。U2N Relay场景的系统架构示意图如图3所示，远端UE和中继UE之间建立PC5链路，再由中继UE与NG-RAN(下一代无线接入网)建立连接；通过RAN与远端UE的5GC节点以及中继UE的5GC节点进行数据传输。其中，远端UE的5GC节点至少包括图3中示意出的远端UE的AMF、远端UE的SMF、远端UE的UPF、数据网络(Data Network)；中继UE的5GC节点至少包括图3中示意出的中继UE的AMF、中继UE的SMF、中继UE的UPF、数据网络(Data Network)；此外，中继UE与NG-RAN之间通过Uu接口进行数据传输，5GC各个节点的通信接口与前述图2的说明相同，这里不做重复说明。
U2N Relay场景中，为了实现中继通信，在进行中继通信之前，中继UE和远端UE需要获得必须的配置参数。这些配置参数可以来自PCF、应用服务器、预配置在终端上或者SIM卡中。远端UE在传输数据之前，需要先发现合适的中继UE并与其建立PC5连接。Relay discovery(发现中继)可以有如下方式：Model A(图4)发现流程或者model B(图5)发现流程。其中，Model A发现流程可以如图4所示，中继UE(如图4中的UE1)发送announcement(公告)消息，通过该announcement消息主动广播该中继UE可以提供中继服务的RSC(中继服务码，Relay service code)；远端UE(如图4中的UE2、UE3、UE4和UE5)可以根据接收到的各个中继UE的announcement消息中包含的RSC来选取合适的中继UE。model B发现流程可以如图5所示，远端UE(如图5中的UE1，该UE1还可以称为“discoverer(发现者)”)发送Solicitation(请求)消息，该Solicitation(请求)消息中包含所述远端UE自身需要的RSC；如果该远端UE周围有可以支持RSC的中继UE(比如图5中的UE2和UE3)，则中继UE向远端UE发送response(响应)消息；该远端UE可以从发送response(响应)消息的中继UE中选取合适的中继UE。另外，在L2(第2层)relay discovery-model A中，announcement消息中还需要包括中继UE的serving cell(服务小区)ID(标识)；在L2relay discovery-model B中，response消息中还需要包括中继UE的serving cell(服务小区)ID(标识)。
在Release17中，对于U2N Relay场景仅考虑了intra-gNB(即基站内)的切换，所以不存在源基站需要选择目的基站(或目标基站)进行切换的情况。但是当远端UE移出源基站(比如源gNB)的覆盖范围后，远端UE的inter-gNB(即基站之间)的切换场景还没有研究。因此，需要提供一种方式以实现U2N Relay场景中的基站之间的切换，从而保证远端UE的业务连续性，进而保证用户的体验。
应理解，本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
应理解，在本申请的实施例中提到的“指示”可以是直接指示，也可以是间接指示，还可以是表示具有关联关系。举例说明，A指示B，可以表示A直接指示B，例如B可以通过A获取；也可以表示A间接指示B，例如A指示C，B可以通过C获取；还可以表示A和B之间具有关联关系。
在本申请实施例的描述中，术语“对应”可表示两者之间具有直接对应或间接对应的关系，也可以表示两者之间具有关联关系，也可以是指示与被指示、配置与被配置等关系。
为便于理解本申请实施例的技术方案，以下对本申请实施例的相关技术进行说明，以下相关技术作为可选方案与本申请实施例的技术方案可以进行任意结合，其均属于本申请实施例的保护范围。
图6是根据本申请第一方面实施例的切换方法的示意性流程图。该方法可选地可以应用于图1所示的系统，但并不仅限于此。该方法包括以下内容的至少部分内容。
S610：源网络设备向目标网络设备发送第一信息；所述第一信息用于确定目标中继终端设备；
S620：所述源网络设备接收所述目标网络设备发送的第二信息，将所述第二信息发送至远端终端设备；所述第二信息用于指示所述远端终端设备切换为通过所述目标中继终端设备与所述目标网络设备连接。
本实施例中，网络设备可以为无线接入网(RAN，Radio Access Network)设备，所述源网络设备可以指的是源RAN设备，所述目标网络设备可以指的是目标RAN设备。再具体的，RAN设备可以指的是网络侧的基站，比如gNB、eNB等等；所述源网络设备具体可以为源基站；所述目标网络设备具体可以为目标基站。应理解，所述源网络设备与所述目标网络设备不同。
所述远端终端设备可以称为U2N远端终端设备。所述远端终端设备当前所在的服务小区可以称为源小区，源小区所在的网络设备即前述源网络设备。
所述目标中继终端设备可以称为目标U2N中继终端设备。所述目标中继终端设备可以为远端终端设备所要切换到的目标小区内的中继终端设备；其中，所述目标小区所在的网络设备即前述目标网络设备。
执行S610之前还可以包括：所述源网络设备接收所述远端终端设备发送的测量报告。
具体来说，在一种场景中，所述远端终端设备与所述源网络设备之间可以为直接连接，即所述远端终端设备与所述源网络设备之间通过Uu接口直接进行数据传输；相应的，所述源网络设备接收所述远端终端设备发送的所述测量报告，可以为：所述源网络设备接收远端终端设备通过Uu接口直接发送的测量报告。其中，所述Uu接口为5G系统，E-UTRAN(演进-通用移动通信)系统通用移动通信系统(UMTS，Universal Mobile Telecommunications System)的空中接口。
在另一种场景中，所述远端终端设备与所述源网络设备之间通过源中继终端设备进行连接(或数据传输)；相应的，所述源网络设备接收所述远端终端设备发送的所述测量报告，可以为：所述源网络设备接收所述远端终端设备通过源中继终端设备发送的所述测量报告。其中，所述远端终端设备与所述源中继终端设备之间的连接具体可以为PC5连接；所述源中继终端设备与所述源网络设备之间可以通过Uu接口进行数据传输。
无论上述哪种场景，所述测量报告均可以包括以下至少之一：所述候选中继终端设备的标识，所述候选中继终端设备的信号强度，所述候选中继终端设备所属的候选小区的标识，所述候选中继终端设备所属的所述候选小区的信号强度。
所述测量报告中的所述候选中继终端设备的数量可以为一个或多个，本实施例不对其进行限定。所述候选中继终端设备的标识，具体可以指的是全部候选中继终端设备中每个候选中继终端设备的标识。任意一个候选中继终端设备的标识，具体可以是所述候选中继终端设备的ID。示例性的，该候选中继终端设备的ID可以采用临时移动用户识别码(TMSI，Temporary Mobile Subscriber Identity)、国际移动用户识别码(IMSI，International Mobile Subscriber Identity)、I-RNTI(Inactive Radio Network Temporary Identifier，非激活无线网络临时标识)中任意之一来表示。
所述测量报告中的所述候选中继终端设备的信号强度，具体可以指的是全部候选中继终端设备中每个候选中继终端设备的信号强度。任意一个候选中继终端设备的信号强度，具体可以指的是所述远端终端设备测量得到的该候选中继终端设备的信号接收强度。
所述测量报告中的所述候选中继终端设备所属的候选小区的标识，具体可以指的是全部候选中继终端设备中每个候选中继终端设备所属的候选小区的标识，比如，可以表示为每个候选中继终端设备所属的候选小区的ID。
所述测量报告中的所述候选中继终端设备所属的候选小区的信号强度，可以是所述远端终端设备进 行legacy(传统)Uu接口测量得到的。
需要指出的是，所述测量报告中可以包括上述全部内容，即一个测量报告中可以包括所述候选中继终端设备的标识，所述候选中继终端设备的信号强度，所述候选中继终端设备所属的候选小区的标识，所述候选中继终端设备所属的所述候选小区的信号强度。或者，所述测量报告中可以包括上述部分内容，比如，一个测量报告中可以包括：所述候选中继终端设备的标识，所述候选中继终端设备所属的候选小区的标识；或者，一个测量报告中可以包括：所述候选中继终端设备的标识，所述候选中继终端设备的信号强度。这里不对其可能包括的内容进行穷举。
在所述源网络设备接收到所述测量报告后，所述源网络设备可以采用以下三种方式进行处理，分别来说：
第一种方式、
所述源网络设备基于测量报告，从候选小区中确定所述目标小区；
所述源网络设备基于所述测量报告确定所述目标小区内的候选中继终端设备，从所述目标小区内的候选中继终端设备中，确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
所述源网络设备基于测量报告，从候选小区中确定所述目标小区，可以包括：所述源网络设备从所述测量报告中提取所述候选中继终端设备所属的所述候选小区的信号强度，从所述候选小区中选取信号强度最大的一个候选小区作为所述目标小区。
所述候选小区的信号强度可以包括：RSRP(Reference Signal Receiving Power，参考信号接收功率)测量结果和/或RSRQ(Reference Signal Receiving Quality，参考信号接收强度)测量结果。相应的，所述从所述候选小区中选取信号强度最大的一个候选小区作为所述目标小区，可以包括：从所述候选小区中选取RSRP测量结果最大的一个候选小区作为所述目标小区；或者，从所述候选小区中选取RSRQ测量结果最大的一个候选小区作为所述目标小区；或者，从所述候选小区中选取RSRP测量结果且RSRQ测量结果均最大的一个候选小区作为所述目标小区。
所述源网络设备基于所述测量报告确定所述目标小区内的候选中继终端设备，从所述目标小区内的候选中继终端设备中，确定满足预设条件的所述目标中继终端设备的处理，可以包括以下之一：
所述源网络设备从所述测量报告包含的全部候选中继终端设备中，确定所述目标小区内的候选中继终端设备；所述源网络设备从所述目标小区内的候选中继终端设备中选取负荷最小的一个候选中继终端设备作为所述目标中继终端设备；这里，还需要指出的是，若所述目标小区内的候选中继终端设备中存在负荷最小的多个候选中继终端设备，则可以从负荷最小的多个候选中继终端设备中随机选取任意一个候选中继终端设备作为所述目标中继终端设备；
所述源网络设备从所述测量报告包含的全部候选中继终端设备中，确定所述目标小区内的候选中继终端设备；所述源网络设备基于所述测量报告从所述目标小区内的候选中继终端设备中选取信号强度最大的一个候选中继终端设备作为所述目标中继终端设备；这里，还需要指出的是，若所述目标小区内的候选中继终端设备中存在信号强度最大的多个候选中继终端设备，则可以从信号强度最大的多个候选中继终端设备中随机选取任意一个候选中继终端设备作为所述目标中继终端设备；
所述源网络设备从所述测量报告包含的全部候选中继终端设备中，确定所述目标小区内的候选中继终端设备；所述源网络设备基于所述测量报告从所述目标小区内的候选中继终端设备中选取负荷最小的N个候选中继终端设备，从所述N个候选中继终端设备中选取信号强度最大的一个候选中继终端设备作为所述目标中继终端设备，N为大于等于1的整数；这里，还需要指出的是，若所述N个候选中继终端设备中存在信号强度最大的多个候选中继终端设备，则可以从信号强度最大的多个候选中继终端设备中随机选取任意一个候选中继终端设备作为所述目标中继终端设备；
所述源网络设备从所述测量报告包含的全部候选中继终端设备中，确定所述目标小区内的候选中继终端设备；所述源网络设备基于所述测量报告从所述目标小区内的候选中继终端设备中选取信号强度最大的M个候选中继终端设备，从所述M个候选中继终端设备中选取负荷最小的一个候选中继终端设备作为所述目标中继终端设备，M为大于等于1的整数；这里，还需要指出的是，若所述M个候选中继终端设备中存在负荷最小的多个候选中继终端设备，则可以从负荷最小的多个候选中继终端设备中随机选取任意一个候选中继终端设备作为所述目标中继终端设备。
应理解，所述测量报告中可以包含多个候选中继终端设备，其中，不同的候选中继终端设备所属的候选小区可以相同也可以不同。所述目标小区内的候选中继终端设备，可以为所述测量报告中全部候选中继终端设备中位于所述目标小区内的候选中继终端设备。举例来说，在所述测量报告中包含有10个候选中继终端设备，分别表示为候选中继终端设备1～候选中继终端设备10；其中，候选中继终端设备1、候选中继终端设备2、候选中继终端设备3为候选小区1内的候选中继终端设备，候选中继终端设 备4、候选中继终端设备5为候选小区2内的候选中继终端设备，候选中继终端设备6～候选中继终端设备10为候选小区3内的候选中继终端设备。若目标小区为候选小区2，则目标小区内的候选中继终端设备即前述候选中继终端设备4和候选中继终端设备5。
所述源网络设备可以基于选取得到的所述目标小区以及所述目标小区内的目标中继终端设备，生成所述第一信息。本方式中，所述第一信息，包括以下至少之一：目标小区的标识；所述目标小区内的所述目标中继终端设备的标识。
在一种情况中，所述第一信息，包括目标小区的标识，和所述目标小区内的所述目标中继终端设备的标识。也就是说，第一信息中包含上述目标小区的标识和所述目标小区内的所述目标中继终端设备的标识。
在另一种情况中，所述第一信息，至少包括所述目标小区内的所述目标中继终端设备的标识。也就是说，第一信息中可以仅包含上述目标中继终端设备的标识。
第二种方式、
所述源网络设备基于测量报告，从候选小区中确定所述目标小区；所述源网络设备基于所述测量报告，确定所述目标小区内的候选中继终端设备。
具体来说，所述源网络设备基于测量报告，从候选小区中确定所述目标小区可以包括：所述源网络设备基于所述测量报告中包含的所述候选中继终端设备所属的所述候选小区的信号强度，从所述候选小区中选取信号强度最大的一个候选小区作为所述目标小区。
其中，所述候选小区的信号强度可以包括：RSRP测量结果和/或RSRQ测量结果。相应的，所述从所述候选小区中选取信号强度最大的一个候选小区作为所述目标小区，可以包括：从所述候选小区中选取RSRP测量结果最大的一个候选小区作为所述目标小区；或者，从所述候选小区中选取RSRQ测量结果最大的一个候选小区作为所述目标小区；或者，从所述候选小区中选取RSRP测量结果且RSRQ测量结果均最大的一个候选小区作为所述目标小区。
所述源网络设备基于所述测量报告，确定所述目标小区内的候选中继终端设备，可以包括：所述源网络设备从所述测量报告包含的全部候选中继终端设备中，确定所述目标小区内的候选中继终端设备。
所述测量报告中可以包含多个候选中继终端设备，其中，不同的候选中继终端设备所属的候选小区可以相同也可以不同。所述目标小区内的候选中继终端设备，可以为所述测量报告中全部候选中继终端设备中位于所述目标小区内的候选中继终端设备。举例来说，在所述测量报告中包含有10个候选中继终端设备，分别表示为候选中继终端设备1～候选中继终端设备10；其中，候选中继终端设备1、候选中继终端设备2、候选中继终端设备3为候选小区1内的候选中继终端设备，候选中继终端设备4、候选中继终端设备5为候选小区2内的候选中继终端设备，候选中继终端设备6～候选中继终端设备10为候选小区3内的候选中继终端设备。若目标小区为候选小区1，则目标小区内的候选中继终端设备即前述候选中继终端设备1、候选中继终端设备2、候选中继终端设备3。
所述源网络设备可以基于选取得到的所述目标小区以及所述目标小区内的目标中继终端设备，生成所述第一信息。本方式中，所述第一信息，包括以下至少之一：目标小区的标识；所述目标小区内的所述候选中继终端设备的标识；所述目标小区内的候选中继终端设备的信号强度。
在一种情况中，所述第一信息，包括目标小区的标识，所述目标小区内的所述候选中继终端设备的标识，和所述目标小区内的候选中继终端设备的信号强度。
在另一种情况中，所述第一信息，至少包括所述目标小区内的所述候选中继终端设备的标识。也就是说，第一信息中可以仅包含所述候选中继终端设备的标识。
在又一种情况中，所述第一信息，包括所述目标小区内的所述候选中继终端设备的标识，和所述目标小区内的候选中继终端设备的信号强度。也就是说，第一信息中可以仅包含所述候选中继终端设备的标识及其信号强度。
第三种方式、
所述源网络设备基于测量报告，从候选小区中确定目标小区所在的目标网络设备；所述源网络设备基于所述测量报告，确定所述目标网络设备内的候选中继终端设备。
具体来说，所述源网络设备基于测量报告，从候选小区中确定目标小区所在的目标网络设备，可以包括：所述源网络设备基于所述测量报告中包含的所述候选中继终端设备所属的所述候选小区的信号强度，从所述候选小区中选取信号强度最大的一个候选小区作为所述目标小区；将所述目标小区所在网络设备作为所述目标网络设备。
其中，所述源网络设备基于所述测量报告中包含的所述候选中继终端设备所属的所述候选小区的信号强度，从所述候选小区中选取信号强度最大的一个候选小区作为所述目标小区的处理方式与前述第一种方式或第二种方式相同，这里不做重复说明。
所述源网络设备基于所述测量报告，确定所述目标网络设备内的候选中继终端设备，可以包括：所述源网络设备确定所述目标网络设备内的全部服务小区；所述源网络设备从所述测量报告包含的全部候选中继终端设备中，确定所述目标网络设备的全部服务小区内的候选中继终端设备。
所述测量报告中可以包含多个候选中继终端设备，其中，不同的候选中继终端设备所属的候选小区可以相同也可以不同。所述目标小区内的候选中继终端设备，可以为所述测量报告中全部候选中继终端设备中位于所述目标小区内的候选中继终端设备。举例来说，在所述测量报告中包含有10个候选中继终端设备，分别表示为候选中继终端设备1～候选中继终端设备10；其中，候选中继终端设备1、候选中继终端设备2、候选中继终端设备3为候选小区1内的候选中继终端设备，候选中继终端设备4、候选中继终端设备5为候选小区2内的候选中继终端设备，候选中继终端设备6～候选中继终端设备10为候选小区3内的候选中继终端设备。若目标小区为候选小区1，该候选小区属于目标网络设备A，该目标网络设备A中包含候选小区1以及候选小区2，则目标网络设备A的全部服务小区内的候选中继终端设备包括：候选小区1和候选小区2内的候选中继终端设备即前述候选中继终端设备1、候选中继终端设备2、候选中继终端设备3、候选中继终端设备4、候选中继终端设备5。
所述源网络设备可以基于选取得到的所述目标小区以及所述目标小区内的目标中继终端设备，生成所述第一信息。本方式中，所述第一信息，包括以下至少之一：目标网络设备的标识；所述目标网络设备内的候选中继终端设备的标识；所述目标网络设备内的候选中继终端设备的信号强度。
在一种情况中，所述第一信息，包括目标网络设备的标识，所述目标网络设备内的候选中继终端设备的信号强度，和所述目标网络设备内的所述候选中继终端设备的标识。
在另一种情况中，所述第一信息，至少包括所述目标网络设备内的所述候选中继终端设备的标识。也就是说，第一信息中可以仅包含所述候选中继终端设备的标识。
在又一种情况中，所述第一信息，包括所述目标网络设备内的候选中继终端设备的标识，所述目标网络设备内的候选中继终端设备的信号强度。也就是说，第一信息中可以仅包含所述候选中继终端设备的标识及其信号强度。
在源网络设备基于前述处理生成第一信息之后，可以执行前述S610，即源网络设备向目标网络设备发送第一信息。
具体来说，在一种场景下，所述源网络设备与所述目标网络设备之间通过Xn接口直接连接；相应的，源网络设备向目标网络设备发送第一信息，可以包括：所述源网络设备通过与所述目标网络设备之间的Xn接口，将所述第一信息直接发送至所述目标网络设备。所述第一信息可以由切换请求消息携带。其中，Xn接口可以为NG-RAN节点(比如gNB或ng-eNB)之间的网络接口。
需要理解，所述切换请求消息中除了上述第一信息之外，还可以携带其他内容，举例来说，可以包括：切换原因、UE上下文信息、RRC上下文信息等，这里不做穷举。
在另一种场景下，所述源网络设备与所述目标网络设备之间通过核心网设备进行数据传输；相应的，源网络设备向目标网络设备发送第一信息，可以包括：所述源网络设备通过核心网设备向所述目标网络设备发送所述第一信息。
所述源网络设备通过核心网设备向所述目标网络设备发送所述第一信息，具体可以指的是：所述源网络设备将携带所述第一信息的切换需求(Handover Required)消息发送至源AMF；所述源AMF向目标AMF发送携带该第一信息的Namf_Communication_CreateUEContext Request(namf_通信_创建UE上下文请求)；目标AMF向目标网络设备发送携带该第一信息的切换请求(Handover Request)消息。
其中，所述目标AMF向目标网络设备发送携带该第一信息的切换请求(Handover Request)消息的处理之前，核心网设备的处理还可以包括：目标AMF向SMF发送Nsmf_PDU Session_UpdateSMContext Request；SMF选择UPF(UPF Selection)；SMF向PSA(PDU session anchor，PDU会话锚点)UPF发送N4会话修改请求(N4 Session Modification Request)；PSA UPF向SMF发送N4会话修改响应(N4 Session Modification Response)；SMF向目标UPF发送N4会话建立请求(N4 Session Establishment Request)；目标UPF向SMF发送N4会话建立响应(N4 Session Establishment Response)；SMF向目标AMF发送Nsmf_PDU Session_UpdateSMContext Response；目标AMF与SMF之间进行PDU切换响应管理(PDU Handover Response supervision)。
所述切换需求(Handover Required)消息中除了上述第一信息之外，还可以携带其他内容，举例来说，可以包括：target(目标)TAI(tracking area identity，跟踪区域标识)、切换原因、UE上下文信息、RRC上下文信息等，这里不做穷举。
在所述源网络设备向目标网络设备发送第一信息后，可以执行S620，即所述源网络设备接收所述目标网络设备发送的第二信息，将所述第二信息发送至远端终端设备。
针对所述源网络设备接收所述目标网络设备发送的第二信息进行说明：
在一种场景下，所述源网络设备与所述目标网络设备之间通过Xn接口直接连接；相应的，所述源网络设备接收所述目标网络设备发送的第二信息，可以包括：所述源网络设备通过Xn接口接收目标网络设备发送的第二信息，该第二信息可以由切换请求确认消息携带。
其中，Xn接口可以为NG-RAN节点(比如gNB或ng-eNB)之间的网络接口。
在另一种场景下，所述源网络设备与所述目标网络设备之间通过核心网设备进行数据传输；相应的，所述源网络设备接收所述目标网络设备发送的第二信息，可以包括：所述源网络设备通过核心网设备接收所述目标网络设备发送的第二信息。
其中，所述源网络设备通过核心网设备接收所述目标网络设备发送的第二信息，具体可以包括：
目标网络设备向目标AMF发送携带所述第二信息的切换请求应答(Handover Request Acknowledge)消息；目标AMF向源AMF发送携带第二信息的Namf_Communication_CreateUEContext Response(namf_通信_创建UE上下文响应)；源AMF向所述源网络设备发送携带所述第二信息的切换命令。
其中，目标AMF向源AMF发送携带第二信息的Namf_Communication_CreateUEContext Response(namf_通信_创建UE上下文响应)之前，在核心网设备的具体处理还可以包括：目标AMF向SMF发送Nsmf_PDUSession_UpdateSMContext Request(nsmf-PDU会话更新SM内容请求)；SMF向目标UPF发送N4会话修改请求；目标UPF向SMF发送N4会话修改响应；SMF向源UPF发送N4会话修改请求；源UPF向SMF发送N4会话修改响应；SMF向目标AMF发送Nsmf_PDUSession_UpdateSMContext Response(nsmf-PDU会话更新SM内容响应)。
针对所述源网络设备将所述第二信息发送至远端终端设备进行说明：
场景1、所述远端终端设备与所述源网络设备之间可以为直接连接，即所述远端终端设备与所述源网络设备之间通过Uu接口直接进行数据传输。
所述将所述第二信息发送至远端终端设备，具体可以为：源网络设备通过Uu接口向远端终端设备发送所述第二信息。其中，所述第二信息可以由RRC(无线资源控制，Radio Resource Control)重配置消息携带。
在完成前述向远端终端设备发送第二信息的处理之后，所述源网络设备可以释放与所述远端终端设备之间的连接。
场景2、所述远端终端设备与所述源网络设备之间通过源中继终端设备进行连接(或数据传输)。其中，所述远端终端设备与所述源中继终端设备之间的连接具体可以为PC5连接；所述源中继终端设备与所述源网络设备之间可以通过Uu接口进行数据传输。
所述将所述第二信息发送至远端终端设备，具体可以为：源网络设备通过源中继终端设备将所述第二信息发送至所述远端终端设备。其中，所述第二信息可以由RRC(无线资源控制，Radio Resource Control)重配置消息携带。
在场景2中，源网络设备通过源中继终端设备向所述远端终端设备发送所述第二信息之后，还可以包括：所述源网络设备向所述源中继终端设备发送第三信息；所述第三信息用于指示所述源中继终端设备释放与所述远端终端设备之间的连接。相应的，所述源中继终端设备接收到所述第三信息后，可以释放与所述远端终端设备之间的连接。所述第三信息可以由RRC重配置消息携带。在完成前述向远端终端设备发送第三信息的处理之后，所述源网络设备可以释放与所述远端终端设备之间的连接。
上述场景1和场景2中，所述第二信息中可以包括所述目标中继终端设备的标识；另外所述第二信息中还可以包括目标小区的标识。所述第二信息具体可以为切换命令，或者所述第二信息具体可以为由RRC重配置消息携带的切换命令。
可见，通过采用上述方案，由源网络设备向目标网络设备发送用于确定目标中继终端设备的第一信息，在源网络设备接收到目标网络设备发来的第二信息的情况下，源网络设备可以向远端终端设备发送该第二信息，以使得远端终端设备基于第二信息切换为通过目标中继终端设备与目标网络设备建立连接。这样，可以实现远端终端设备进行网络设备的切换处理，并且可以避免远端终端设备在发生网络设备的切换的过程中，由于无法尽快通过目标中继终端设备与目标网络设备建立连接所带来的数据包的丢失问题，如此就可以保证远端终端设备的业务连续性。
图7是根据本申请第二方面实施例的切换方法的示意性流程图。该方法可选地可以应用于图1所示的系统，但并不仅限于此。该方法包括以下内容的至少部分内容。
S710：目标网络设备接收源网络设备发送的第一信息；所述第一信息用于确定目标中继终端设备；
S720：所述目标网络设备向所述源网络设备发送第二信息；所述第二信息用于指示远端终端设备切换为通过所述目标中继终端设备与所述目标网络设备连接。
本实施例中，网络设备可以为无线接入网(RAN，Radio Access Network)设备，所述源网络设备可以指的是源RAN设备，所述目标网络设备可以指的是目标RAN设备。再具体的，RAN设备可以指 的是网络侧的基站，比如gNB、eNB等等；所述源网络设备具体可以为源基站；所述目标网络设备具体可以为目标基站。应理解，所述源网络设备与所述目标网络设备不同。
所述远端终端设备可以称为U2N远端终端设备。所述远端终端设备当前所在的服务小区可以称为源小区，源小区所在的网络设备即前述源网络设备。
所述目标中继终端设备可以称为目标U2N中继终端设备。所述目标中继终端设备可以为远端终端设备所要切换到的目标小区内的中继终端设备；其中，所述目标小区所在的网络设备即前述目标网络设备。
前述S710中目标网络设备接收源网络设备发送的第一信息，可以有以下场景：
在一种场景下，所述目标网络设备与所述源网络设备之间通过Xn接口直接连接；相应的，目标网络设备接收源网络设备发送的第一信息，可以包括：所述目标网络设备通过Xn接口接收源网络设备通过发送的第一信息。其中，Xn接口可以为NG-RAN节点(比如gNB或ng-eNB)之间的网络接口。
所述第一信息可以由切换请求消息携带。需要理解，所述切换请求消息中除了上述第一信息之外，还可以携带其他内容，举例来说，可以包括：切换原因、UE上下文信息、RRC上下文信息等，这里不做穷举。
在另一种场景下，所述目标网络设备与所述源网络设备之间通过核心网设备进行数据传输；相应的，目标网络设备接收源网络设备发送的第一信息，可以包括：所述目标网络设备通过核心网设备接收所述源网络设备发送的所述第一信息。
所述目标网络设备通过核心网设备接收所述源网络设备发送的所述第一信息，具体可以指的是：所述源网络设备将携带所述第一信息的切换需求(Handover Required)消息发送至源AMF；所述源AMF向目标AMF发送携带该第一信息的Namf_Communication_CreateUEContext Request(namf_通信_创建UE上下文请求)；目标网络设备接收目标AMF发送的携带该第一信息的切换请求消息。
其中，所述目标网络设备接收目标AMF发送的携带该第一信息的切换请求消息的处理之前，核心网设备的处理还可以包括：目标AMF向SMF发送Nsmf_PDU Session_UpdateSMContext Request；SMF选择UPF(UPF Selection)；SMF向PSA(PDU session anchor，PDU会话锚点)UPF发送N4会话修改请求(N4 Session Modification Request)；PSA UPF向SMF发送N4会话修改响应(N4 Session Modification Response)；SMF向目标UPF发送N4会话建立请求(N4 Session Establishment Request)；目标UPF向SMF发送N4会话建立响应(N4 Session Establishment Response)；SMF向目标AMF发送Nsmf_PDU Session_UpdateSMContext Response；目标AMF与SMF之间进行PDU切换响应管理(PDU Handover Response supervision)。
所述切换需求(Handover Required)消息中除了上述第一信息之外，还可以携带其他内容，举例来说，可以包括：target(目标)TAI(tracking area identity，跟踪区域标识)、切换原因、UE上下文信息、RRC上下文信息等，这里不做穷举。
完成S710后，即所述目标网络设备接收源网络设备发送的第一信息之后，所述目标网络设备可以基于所述第一信息，确定目标中继终端设备。具体的，在第一信息中包含的内容不同的情况下，所述目标网络设备基于所述第一信息确定目标中继终端设备的处理方式也有所不同，分别来说：
第一种处理方式、
所述第一信息，包括以下至少之一：目标小区的标识；所述目标小区内的所述目标中继终端设备的标识。
在一种情况中，所述第一信息，包括目标小区的标识，和所述目标小区内的所述目标中继终端设备的标识。也就是说，第一信息中包含上述目标小区的标识和所述目标小区内的所述目标中继终端设备的标识。
在另一种情况中，所述第一信息，至少包括所述目标小区内的所述目标中继终端设备的标识。也就是说，第一信息中可以仅包含上述目标中继终端设备的标识。
所述目标网络设备可以基于所述第一信息，确定所述目标中继终端设备。具体的，所述目标网络设备可以直接从所述第一信息中获取所述目标中继终端设备的标识，基于该目标中继终端设备的标识确定所述目标中继终端设备。
进一步地，在所述第一信息还包括目标小区的标识的情况下，还可以包括：所述目标网络设备基于所述第一信息中包含的目标小区的标识，确定所述目标中继终端设备所属的目标小区。
在所述第一信息中不包括目标小区的标识的情况下，还可以包括：所述目标网络设备基于所述目标中继终端设备的标识，确定所述目标中继终端设备所属的目标小区。
第二种处理方式、
所述第一信息，包括以下至少之一：目标小区的标识；所述目标小区内的所述候选中继终端设备的 标识；所述目标小区内的候选中继终端设备的信号强度。
在一种情况中，所述第一信息，包括目标小区的标识，所述目标小区内的所述候选中继终端设备的标识，和所述目标小区内的候选中继终端设备的信号强度。
在另一种情况中，所述第一信息，至少包括所述目标小区内的所述候选中继终端设备的标识。也就是说，第一信息中可以仅包含所述候选中继终端设备的标识。
在又一种情况中，所述第一信息，包括所述目标小区内的所述候选中继终端设备的标识，和所述目标小区内的候选中继终端设备的信号强度。也就是说，第一信息中可以仅包含所述候选中继终端设备的标识及其信号强度。
所述目标网络设备基于所述第一信息确定所述目标小区内的候选中继终端设备；从所述目标小区内的候选中继终端设备中确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
所述目标网络设备基于所述第一信息确定所述目标小区内的候选中继终端设备，具体可以为：所述目标网络设备基于所述第一信息中包含的目标小区的标识确定所述目标小区，基于所述第一信息中包含的目标小区内的候选中继终端设备的标识确定所述候选中继终端设备。
所述从所述目标小区内的候选中继终端设备中确定满足预设条件的所述目标中继终端设备的处理，可以包括以下之一：
所述源网络设备从所述目标小区内的候选中继终端设备中，选取负荷最小的一个候选中继终端设备作为所述目标中继终端设备；这里，还需要指出的是，若所述目标小区内的候选中继终端设备中存在负荷最小的多个候选中继终端设备，则可以从负荷最小的多个候选中继终端设备中随机选取任意一个候选中继终端设备作为所述目标中继终端设备；
所述源网络设备从所述目标小区内的候选中继终端设备中，选取信号强度最大的一个候选中继终端设备作为所述目标中继终端设备；这里，还需要指出的是，若所述目标小区内的候选中继终端设备中存在信号强度最大的多个候选中继终端设备，则可以从信号强度最大的多个候选中继终端设备中随机选取任意一个候选中继终端设备作为所述目标中继终端设备；
所述源网络设备从所述目标小区内的候选中继终端设备中，选取负荷最小的L个候选中继终端设备，从所述L个候选中继终端设备中选取信号强度最大的一个候选中继终端设备作为所述目标中继终端设备，L为大于等于1的整数；这里，还需要指出的是，若所述L个候选中继终端设备中存在信号强度最大的多个候选中继终端设备，则可以从信号强度最大的多个候选中继终端设备中随机选取任意一个候选中继终端设备作为所述目标中继终端设备；
所述源网络设备从所述目标小区内的候选中继终端设备中，选取信号强度最大的K个候选中继终端设备，从所述K个候选中继终端设备中选取负荷最小的一个候选中继终端设备作为所述目标中继终端设备，K为大于等于1的整数；这里，还需要指出的是，若所述K个候选中继终端设备中存在负荷最小的多个候选中继终端设备，则可以从负荷最小的多个候选中继终端设备中随机选取任意一个候选中继终端设备作为所述目标中继终端设备。
第三种处理方式、
所述第一信息，包括以下至少之一：目标网络设备的标识；所述目标网络设备内的候选中继终端设备的标识；所述目标网络设备内的候选中继终端设备的信号强度。
在一种情况中，所述第一信息包含的第一信息，包括目标网络设备的标识，所述目标网络设备内的候选中继终端设备的信号强度，和所述目标网络设备内的所述候选中继终端设备的标识。
在另一种情况中，所述第一信息，至少包括所述目标网络设备内的所述候选中继终端设备的标识。也就是说，第一信息中可以仅包含所述候选中继终端设备的标识。
在又一种情况中，所述第一信息，包括所述目标网络设备内的候选中继终端设备的标识，所述目标网络设备内的候选中继终端设备的信号强度。也就是说，第一信息中可以仅包含所述候选中继终端设备的标识及其信号强度。
所述目标网络设备基于所述第一信息确定所述目标网络设备内的候选中继终端设备；从所述目标网络设备内的候选中继终端设备中，确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
所述目标网络设备基于所述第一信息确定所述目标网络设备内的候选中继终端设备，具体可以为：所述目标网络设备基于所述第一信息中包含的目标网络设备的标识确定所述目标网络设备，基于所述第一信息中包含的目标网络设备内的候选中继终端设备的标识确定所述候选中继终端设备。
从所述目标网络设备内的候选中继终端设备中，确定满足预设条件的所述目标中继终端设备的处理，可以包括以下之一：
所述目标网络设备从所述目标网络设备内的候选中继终端设备中，选取负荷最小的一个候选中继终端设备作为所述目标中继终端设备；这里，还需要指出的是，若所述目标网络设备内的候选中继终端设备中存在负荷最小的多个候选中继终端设备，则可以从负荷最小的多个候选中继终端设备中随机选取任意一个候选中继终端设备作为所述目标中继终端设备；
所述目标网络设备从所述目标网络设备内的候选中继终端设备中，选取信号强度最大的一个候选中继终端设备作为所述目标中继终端设备；这里，还需要指出的是，若所述目标网络设备内的候选中继终端设备中存在信号强度最大的多个候选中继终端设备，则可以从信号强度最大的多个候选中继终端设备中随机选取任意一个候选中继终端设备作为所述目标中继终端设备；
所述目标网络设备从所述目标网络设备内的候选中继终端设备中，选取负荷最小的L个候选中继终端设备，从所述L个候选中继终端设备中选取信号强度最大的一个候选中继终端设备作为所述目标中继终端设备，L为大于等于1的整数；这里，还需要指出的是，若所述L个候选中继终端设备中存在信号强度最大的多个候选中继终端设备，则可以从信号强度最大的多个候选中继终端设备中随机选取任意一个候选中继终端设备作为所述目标中继终端设备；
所述目标网络设备从所述目标网络设备内的候选中继终端设备中，选取信号强度最大的K个候选中继终端设备，从所述K个候选中继终端设备中选取负荷最小的一个候选中继终端设备作为所述目标中继终端设备，K为大于等于1的整数；这里，还需要指出的是，若所述K个候选中继终端设备中存在负荷最小的多个候选中继终端设备，则可以从负荷最小的多个候选中继终端设备中随机选取任意一个候选中继终端设备作为所述目标中继终端设备。
进一步地，在所述目标网络设备确定所述目标中继终端设备之后，还可以将目标中继终端设备所在的小区作为目标小区。
基于前述处理，所述目标网络设备可以确定所述目标中继终端设备，并且还可以确定目标小区；进而所述目标终端设备可以生成所述第二信息。其中，所述第二信息包括：所述目标中继终端设备的标识；另外，所述第二信息中还可以包括所述目标小区的标识。应理解，在所述目标网络设备生成所述第二信息之前，还可以基于所述目标中继终端设备进行以下处理，比如：进行目标小区资源准入，为所述目标中继终端设备的接入分配空口资源和业务的承载资源等等，这里不对其进行穷举。
完成前述处理后，可以执行S720，即所述目标网络设备向所述源网络设备发送第二信息。具体来说：
在一种场景下，所述目标网络设备与所述源网络设备之间通过Xn接口直接连接；相应的，所述目标网络设备向所述源网络设备发送第二信息，可以包括：所述目标网络设备通过Xn接口向所述源网络设备发送所述第二信息，该第二信息可以由切换请求确认消息携带。其中，Xn接口可以为NG-RAN节点(比如gNB或ng-eNB)之间的网络接口。
在另一种场景下，所述目标网络设备与所述源网络设备之间通过核心网设备进行数据传输；相应的，所述目标网络设备向所述源网络设备发送第二信息，可以包括：所述目标网络设备通过核心网设备向所述目标网络设备发送所述第二信息。
其中，所述目标网络设备通过核心网设备向所述目标网络设备发送所述第二信息，具体可以包括：目标网络设备向目标AMF发送携带所述第二信息的切换请求应答(Handover Request Acknowledge)消息；目标AMF向源AMF发送携带第二信息的Namf_Communication_CreateUEContext Response(namf_通信_创建UE上下文响应信息)；源AMF向所述源网络设备发送携带所述第二信息的切换命令。
其中，目标AMF向源AMF发送携带第二信息的Namf_Communication_CreateUEContext Response(namf_通信_创建UE上下文响应)之前，在核心网设备的具体处理还可以包括：目标AMF向SMF发送Nsmf_PDUSession_UpdateSMContext Request；SMF向目标UPF发送N4会话修改请求；目标UPF向SMF发送N4会话修改响应；SMF向源UPF发送N4会话修改请求；源UPF向SMF发送N4会话修改响应；SMF向目标AMF发送Nsmf_PDU Session_UpdateSMContext Response。
在一种实施方式中，所述方法还包括：所述目标网络设备向所述目标中继终端设备发送第四信息；所述第四信息用于指示所述目标中继终端设备与所述远端终端设备建立连接。其中，所述第四信息中可以包括所述目标中继终端设备的标识，所述第四信息可以由RRC重配置消息携带。
需要指出的是，所述目标网络设备向所述目标中继终端设备发送第四信息的处理可以是在目标网络设备生成第二信息之后、且向所述源网络设备发送第二信息之前执行的；或者，可以是在所述目标网络设备向所述源网络设备发送第二信息之后执行的，本实施例不对其进行限定。
在所述目标中继终端设备接收到所述第四信息之后，所述目标中继终端设备可以基于所述第四信息确定与所述远端终端设备准备建立连接。
进而，还可以包括：所述目标网络设备通过所述目标中继终端设备接收所述远端终端设备发送的第 五信息；所述第五信息用于表示所述远端终端设备完成路径切换。其中，所述第五信息可以由RRC重配置完成消息携带。
在所述目标网络设备接收到所述第五信息之后，可以确定所述远端终端设备已经与所述目标中继终端设备建立连接，然后可以通过所述目标中继终端设备与所述远端终端设备进行上行和/或下行的数据传输。
可见，由源网络设备向目标网络设备发送用于确定目标中继终端设备的第一信息，目标网络设备向源网络设备发送第二信息，使得源网络设备可以向远端终端设备发送该第二信息，进而远端终端设备可以基于第二信息切换为通过目标中继终端设备与目标网络设备建立连接。这样，可以实现远端终端设备进行网络设备的切换处理，并且可以避免远端终端设备在发生网络设备的切换的过程中，由于无法尽快通过目标中继终端设备与目标网络设备建立连接所带来的数据包的丢失问题，如此就可以保证远端终端设备的业务连续性。
图8是根据本申请第三方面实施例的切换方法的示意性流程图。该方法可选地可以应用于图1所示的系统，但并不仅限于此。该方法包括以下内容的至少部分内容。
S810：远端终端设备接收源网络设备发送的第二信息；所述第二信息用于指示远端终端设备切换为通过目标中继终端设备与目标网络设备连接。
本实施例中，网络设备可以为无线接入网(RAN，Radio Access Network)设备，所述源网络设备可以指的是源RAN设备，所述目标网络设备可以指的是目标RAN设备。再具体的，RAN设备可以指的是网络侧的基站，比如gNB、eNB等等；所述源网络设备具体可以为源基站；所述目标网络设备具体可以为目标基站。应理解，所述源网络设备与所述目标网络设备不同。
所述远端终端设备可以称为U2N远端终端设备。所述远端终端设备当前所在的服务小区可以称为源小区，源小区所在的网络设备即前述源网络设备。
所述目标中继终端设备可以称为目标U2N中继终端设备。所述目标中继终端设备可以为远端终端设备所要切换到的目标小区内的中继终端设备；其中，所述目标小区所在的网络设备即前述目标网络设备。
执行S810之前还可以包括：所述远端终端设备生成测量报告。其中，所述测量报告，可以为所述远端终端设备对候选中继终端设备发出的消息测量得到的、以及对legacy(传统)Uu接口测量得到的。
所述测量报告可以包括以下至少之一：所述候选中继终端设备的标识，所述候选中继终端设备的信号强度，所述候选中继终端设备所属的候选小区的标识，所述候选中继终端设备所属的所述候选小区的信号强度。
所述测量报告中的所述候选中继终端设备的数量可以为一个或多个，本实施例不对其进行限定。所述候选中继终端设备的标识，具体可以指的是全部候选中继终端设备中每个候选中继终端设备的标识。任意一个候选中继终端设备的标识，具体可以是所述候选中继终端设备的ID。示例性的，该候选中继终端设备的ID可以采用临时移动用户识别码(TMSI，Temporary Mobile Subscriber Identity)、国际移动用户识别码(IMSI，International Mobile Subscriber Identity)、I-RNTI(Inactive Radio Network Temporary Identifier，非激活无线网络临时标识)中任意之一来表示。
其中，所述候选中继终端设备为满足中继选择准则的中继终端设备；所述中继选择准则至少可以包括：RSC符合要求，即所述候选中继终端设备支持的RSC为所述远端终端设备需要的RSC。所述远端终端设备可以通过Model A发现流程或者model B发现流程，确定所述候选中继终端设备。具体的：
在Model A发现流程中，所述远端终端设备可以根据接收到的各个中继终端设备的announcement消息中包含的RSC，选取RSC符合要求的中继终端设备作为所述候选中继终端设备。举例来说，所述远端终端设备可以接收到5个中继终端设备的announcement消息，所述远端终端设备从announcement消息中获取该5个中继终端设备分别支持的RSC；若5个中继终端设备中有3个中继终端设备的RSC为所述远端终端设备需要的RSC，则这3个中继终端设备为该远端终端设备的候选中继终端设备。
在model B发现流程中，所述远端终端设备发送Solicitation(请求)消息，该Solicitation(请求)消息中包含所述远端终端设备自身需要的RSC；如果所述远端终端设备周围有可以支持RSC的中继终端设备，则中继终端设备向所述远端终端设备发送response(响应)消息；所述远端终端设备可以将发送该response(响应)消息的中继终端设备作为候选中继终端设备。举例来说，所述远端终端设备周边有6个中继终端设备；所述远端终端设备发送Solicitation(请求)消息，该Solicitation(请求)消息中包含所述远端终端设备自身需要的RSC；如果所述远端终端设备周围有可以支持RSC的3个中继终端设备，则这3个中继终端设备向所述远端终端设备发送response(响应)消息；所述远端终端设备可以将这3个中继终端设备作为候选中继终端设备。
所述测量报告中的所述候选中继终端设备的信号强度，具体可以指的是全部候选中继终端设备中每 个候选中继终端设备的信号强度。任意一个候选中继终端设备的信号强度，具体可以指的是所述远端终端设备测量得到的该候选中继终端设备的信号接收强度。
前述已经说明，Relay discovery(发现中继)可以有Model A发现流程或者model B发现流程。所述远端终端设备测量得到的所述候选中继终端设备的信号的接收强度的处理方式，结合前述Model A发现流程或者model B发现流程分别进行说明：在Model A发现流程中，所述远端终端设备测量得到的所述候选中继终端设备的信号的接收强度的处理方式，可以包括：远端终端设备测量得到的各个候选中继终端设备发送的announcement(公告)消息的接收强度。在Model B发现流程中，远端终端设备主动发送自己需要的RSC进而接收候选中继终端设备发送的响应(response)消息，所述候选中继终端设备的信号强度具体可以指的是远端终端设备测量得到的响应消息的接收强度。
所述测量报告中的所述候选中继终端设备所属的候选小区的标识，具体可以指的是全部候选中继终端设备中每个候选中继终端设备所属的候选小区的标识，比如，可以表示为每个候选中继终端设备所属的候选小区的ID。
其中，候选中继终端设备所属的候选小区的标识，可以是候选中继终端设备所发送的相关消息中携带的。比如，所述候选中继终端设备所属的候选小区的标识可以是Model A发现流程中的announcement消息中携带的；或者，所述候选中继终端设备所属的候选小区的标识可以是model B发现流程中的响应(response)消息中携带的。
所述测量报告中的所述候选中继终端设备所属的候选小区的信号强度，可以是所述远端终端设备进行legacy(传统)Uu接口测量得到的。所述候选小区的信号强度可以包括：RSRP(Reference Signal Receiving Power，参考信号接收功率)测量结果和/或RSRQ(Reference Signal Receiving Quality，参考信号接收强度)测量结果。legacy(传统)Uu接口测量，可以是根据测量配置执行的。该测量配置主要由源网络设备通过RRCConnectionReconfigurtion(RRC连接重配置)消息携带的measConfig(测量配置)信元发送的。所述测量配置中包含以下至少之一：远端终端设备需要测量的对象、小区列表、报告方式、测量标识、事件参数等。
需要指出的是，所述测量报告中可以包括上述全部内容，即一个测量报告中可以包括所述候选中继终端设备的标识，所述候选中继终端设备的信号强度，所述候选中继终端设备所属的候选小区的标识，所述候选中继终端设备所属的所述候选小区的信号强度。或者，所述测量报告中可以包括上述部分内容，比如，一个测量报告中可以包括：所述候选中继终端设备的标识，所述候选中继终端设备所属的候选小区的标识；或者，一个测量报告中可以包括：所述候选中继终端设备的标识，所述候选中继终端设备的信号强度。这里不对其可能包括的内容进行穷举。
在所述远端终端设备生成所述测量报告之后，所述方法还包括：所述远端终端设备向所述源网络设备发送测量报告。具体的，在不同的场景下，所述远端终端设备向所述源网络设备发送测量报告的具体方式可以不同，分别来说：
在一种场景中，所述远端终端设备与所述源网络设备之间可以为直接连接，即所述远端终端设备与所述源网络设备之间通过Uu接口直接进行数据传输；相应的，所述远端终端设备向所述源网络设备发送测量报告，可以为：所述远端终端设备通过Uu接口向所述源网络设备直接发送所述测量报告。
在本场景中，完成前述处理之后，可以执行S810，即远端终端设备接收源网络设备发送的第二信息。
所述远端终端设备接收源网络设备发送的第二信息，具体可以为：所述远端终端设备接收源网络设备通过Uu接口直接发送的所述第二信息。
在另一种场景中，所述远端终端设备与所述源网络设备之间通过源中继终端设备进行连接(或数据传输)；相应的，所述远端终端设备向所述源网络设备发送测量报告，可以为：所述远端终端设备通过源中继终端设备，向所述源网络设备发送测量报告。其中，所述远端终端设备与所述源中继终端设备之间的连接具体可以为PC5连接；所述源中继终端设备与所述源网络设备之间可以通过Uu接口进行数据传输。
在本场景中，完成前述处理之后，可以执行S810，即远端终端设备接收源网络设备发送的第二信息。所述远端终端设备接收源网络设备发送的第二信息，具体可以为：所述远端终端设备通过源中继终端设备，接收源网络设备发送的所述第二信息。
上述两种场景中，所述第二信息中可以包括所述目标中继终端设备的标识；另外所述第二信息中还可以包括目标小区的标识。所述第二信息具体可以为由RRC重配置消息携带的切换命令。
完成前述S810之后，还可以包括：
在所述远端终端设备与所述目标中继终端设备建立连接的情况下，所述远端终端设备通过所述目标中继终端设备，向所述目标网络设备发送第五信息，所述第五信息用于表示所述远端终端设备完成路径 切换。
所述第五信息由RRC重配置完成消息携带。
具体的，所述远端终端设备可以基于所述第二信息中指示的目标中继终端设备的标识确定目标中继终端设备，与目标中继终端设备建立PC5连接；在与所述目标中继终端设备建立PC5连接成功的情况下，所述远端终端设备通过所述目标中继终端设备，向所述目标网络设备发送第五信息，所述第五信息用于表示所述远端终端设备完成路径切换。
在前述处理完成之后，所述远端终端设备可以通过所述目标中继终端设备与目标网络设备进行上行和/或下行的数据传输。
可见，通过采用上述方案，远端终端设备可以接收到源网络设备发送的第二信息，以使得远端终端设备切换为通过目标中继终端设备与目标网络设备建立连接。如此，可以实现远端终端设备进行网络设备的切换处理，并且，由于远端终端设备可以实现网络设备间的切换处理，进一步可以避免远端终端设备在发生网络设备的切换的过程中，由于无法尽快通过目标中继终端设备与目标网络设备建立连接所带来的数据包的丢失问题。
以远端终端设备为Remote(远端)UE(用户设备，User Equipment)，目标中继终端设备为目标(target)Relay(中继)UE，候选中继终端设备为候选Relay UE，源网络设备为源gNB，目标网络设备为目标gNB为例，结合图9对前述第一方面、第二方面、第三方面实施例提供的切换方法进行一种示例性说明，具体的：
S910：Remote UE向源gNB发送测量报告。
所述测量报告用于上报候选Relay UE及legacy Uu测量。
其中，Remote UE上报的候选Relay UE必须都满足relay(中继)选择准则，比如Relay service code(RSC，中继服务码)符合要求，即候选Relay UE支持的RSC为所述远端终端设备需要的RSC。
所述测量报告中至少包括以下至少之一：所述候选Relay UE的ID，所述候选Relay UE的信号强度，所述候选Relay UE所属的候选小区的标识，所述候选Relay UE所属的所述候选小区的信号强度。
其中，Remote UE与源gNB之间(通过Uu接口)直接进行上行和/或下行的数据传输。
S920：源gNB基于测量报告确定目标小区以及目标小区内的目标Relay UE。
具体的，源gNB基于测量报告从候选小区中确定所述目标小区；所述源gNB基于所述测量报告确定所述目标小区内的候选Relay UE，从所述目标小区内的候选Relay UE中，确定满足预设条件的所述目标Relay UE；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
也就是说，在源gNB决定发起将Remote UE的路径切换为通过目标Relay UE与目标gNB连接的情况下，源gNB先确定目标小区(target serving cell)，然后从所述目标小区内的候选Relay UE中，确定满足预设条件的所述目标Relay UE。
进而，源gNB可以生成第一信息，所述第一信息用于确定目标中继终端设备，所述第一信息，包括以下至少之一：目标小区(target serving cell)的ID；所述目标小区内的所述目标Relay UE的ID。
S930：源gNB向目标gNB发送携带第一信息的切换请求(handover request)消息。
所述第一信息用于确定目标中继终端设备，所述第一信息，包括以下至少之一：目标小区(target serving cell)的ID；所述目标小区内的所述目标Relay UE的ID。
本示例中，携带第一信息的切换请求(handover request)消息可以直接发送至目标gNB。
S940：目标gNB向源gNB发送携带第二信息的切换请求(handover request)确认(ACK)消息。
所述第二信息中可以包括所述目标中继终端设备的标识；另外所述第二信息中还可以包括目标小区的标识。
S950：目标gNB向目标Relay UE发送携带第四信息的RRCReconfiguration message(RRC重配置消息)，所述第四信息用于指示所述目标Relay UE与所述Remote UE建立连接。
S960：源gNB向Remote UE发送携带第二信息的RRCReconfiguration(RRC重配置)消息。
需要指出，上述S950与S960的执行顺序不分先后，可以先执行S950再执行S960；或者，可以先执行S960再执行S950；又或者，可以同时执行S950以及S960。
S970：Remote UE与目标Relay UE建立PC5连接。
S980：Remote UE完成路径切换，通过目标Relay UE向目标gNB发送第五信息，该第五信息由RRCReconfigurationComplete(RRC重配置完成)消息携带，用于表示所述远端终端设备完成路径切换。
通过上述处理，Remote UE与目标gNB之间的data path切换为非直连方式。Remote UE通过目标Relay UE与目标gNB进行上行和/或下行数据传输。
以远端终端设备为Remote UE(用户设备，User Equipment)，目标中继终端设备为目标Relay(中继)UE，候选中继终端设备为候选Relay UE，源中继终端设备为源Relay UE，源网络设备为源gNB， 目标网络设备为目标gNB为例，结合图10对前述第一方面、第二方面、第三方面实施例提供的切换方法进行一种示例性说明，具体的：
S1010：Remote UE通过源Relay UE向源gNB发送测量报告。
关于测量报告的相关说明与前一示例相同，这里不做重复说明。
其中，Remote UE与源gNB之间通过源Relay UE进行上行和/或下行的数据传输。
S1020：源gNB基于测量报告确定目标小区以及目标小区内的目标Relay UE。
具体的处理方式与前述S920相同，不做重复说明。
S1030：源gNB向目标gNB发送携带第一信息的切换请求(handover request)消息。
所述第一信息用于确定目标中继终端设备，所述第一信息，包括以下至少之一：目标小区(target serving cell)的ID；所述目标小区内的所述目标Relay UE的ID。
本示例中，携带第一信息的切换请求(handover request)消息可以直接发送至目标gNB。
S1040：目标gNB向源gNB发送携带第二信息的切换请求(handover request)确认(ACK)消息。
所述第二信息中可以包括所述目标中继终端设备的标识；另外所述第二信息中还可以包括目标小区的标识。
S1050：目标gNB向目标Relay UE发送携带第四信息的RRCReconfiguration message(RRC重配置消息)，所述第四信息用于指示所述目标Relay UE与所述Remote UE建立连接。
S1060：源gNB通过源Relay UE向Remote UE发送携带第二信息的RRCReconfiguration(RRC重配置)消息。
需要指出，上述S1050与S1060的执行顺序不分先后，可以先执行S1050再执行S1060；或者，可以先执行S1060再执行S1050；又或者，可以同时执行S1050以及S1060。
S1070：源gNB向源Relay UE发送携带第三信息的RRCReconfiguration(RRC重配置)消息；所述第三信息用于指示所述源中继终端设备释放与所述远端终端设备之间的连接。
S1080：U2N Remote UE与目标Relay UE建立PC5连接。
S1090：Remote UE通过目标Relay UE向目标gNB发送第五信息，该第五信息由RRCReconfigurationComplete(RRC重配置完成)消息携带，用于表示所述远端终端设备完成路径切换。
通过上述处理，Remote UE与目标gNB之间的data path切换为非直连方式。Remote UE通过目标Relay UE与目标gNB进行上行和/或下行数据传输。
以远端终端设备为Remote UE(用户设备，User Equipment)，目标中继终端设备为目标Relay(中继)UE，候选中继终端设备为候选Relay UE，源中继终端设备为源Relay UE，源网络设备为源gNB，目标网络设备为目标gNB为例，结合图11对前述第一方面、第二方面、第三方面实施例提供的切换方法进行一种示例性说明，具体的：
S1110：Remote UE向源gNB发送测量报告。
关于测量报告的相关说明与前述任一示例相同，这里不做重复说明。
其中，Remote UE与源gNB之间(通过Uu接口)直接进行上行和/或下行的数据传输。
S1120：源gNB基于测量报告确定目标小区以及目标小区内的候选Relay UE。
具体的，源gNB基于测量报告从候选小区中确定所述目标小区；所述源gNB基于所述测量报告，确定所述目标小区内的候选Relay UE。
也就是说，在源gNB决定发起将Remote UE的路径切换为通过目标Relay UE与目标gNB连接的情况下，源gNB先确定目标小区(target serving cell)，然后确定所述目标小区内的候选Relay UE。
S1130：源gNB向目标gNB发送携带第一信息的切换请求(handover request)消息。
所述第一信息用于确定目标中继终端设备，所述第一信息，包括以下至少之一：目标小区(target serving cell)的ID；所述目标小区内的候选Relay UE的ID；所述目标小区内的候选Relay UE的信号强度。
本示例中，携带第一信息的切换请求(handover request)消息可以直接发送至目标gNB。
S1140：目标gNB向源gNB发送携带第二信息的切换请求(handover request)确认(ACK)消息。
所述目标网络设备从所述第一信息中的所述目标小区内的候选中继终端设备中，确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
进而，所述目标gNB可以基于所述目标中继终端设备及其所在目标小区，生成第二信息。所述第二信息中可以包括所述目标中继终端设备的标识；另外所述第二信息中还可以包括目标小区的标识。
S1150：目标gNB向目标Relay UE发送携带第四信息的RRCReconfiguration message(RRC重配置消息)，所述第四信息用于指示所述目标Relay UE与所述Remote UE建立连接。
S1160：源gNB向Remote UE发送携带第二信息的RRCReconfiguration(RRC重配置)消息。
需要指出，上述S1150与S1160的执行顺序不分先后，可以先执行S1150再执行S1160；或者，可以先执行S1160再执行S1150；又或者，可以同时执行S1150以及S1160。
S1170：Remote UE与目标Relay UE建立PC5连接。
S1180：Remote UE通过目标Relay UE向目标gNB发送第五信息，该第五信息由RRCReconfigurationComplete(RRC重配置完成)消息携带，用于表示所述远端终端设备完成路径切换。
通过上述处理，Remote UE与目标gNB之间的data path切换为非直连方式。Remote UE通过目标Relay UE与目标gNB进行上行和/或下行数据传输。
以远端终端设备为U2N(终端至网络，UE-to-network)Remote UE(用户设备，User Equipment)，目标中继终端设备为target(目标)候选Relay(中继)UE，候选中继终端设备为候选Relay UE，源中继终端设备为源Relay UE，源网络设备为源gNB，目标网络设备为目标gNB为例，结合图12对前述第一方面、第二方面、第三方面实施例提供的切换方法进行一种示例性说明，具体的：
S1210：Remote UE通过源Relay UE向源gNB发送测量报告。
关于测量报告的相关说明与前一示例相同，这里不做重复说明。
其中，Remote UE与源gNB之间通过源Relay UE进行上行和/或下行的数据传输。
S1220：源gNB基于测量报告确定目标小区以及目标小区内的候选Relay UE。
具体的处理方式与前述S1120相同，不做重复说明。
S1230：源gNB向目标gNB发送携带第一信息的切换请求(handover request)消息。
所述第一信息用于确定目标中继终端设备，所述第一信息，包括以下至少之一：目标小区(target serving cell)的ID；所述目标小区内的候选Relay UE的ID；所述目标小区内的候选Relay UE的信号强度。
本示例中，携带第一信息的切换请求(handover request)消息可以直接发送至目标gNB。
S1240：目标gNB向源gNB发送携带第二信息的切换请求(handover request)确认(ACK)消息。
所述目标网络设备从所述第一信息中的所述目标小区内的候选中继终端设备中，确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
进而，所述目标gNB可以基于所述目标中继终端设备及其所在目标小区，生成第二信息。所述第二信息中可以包括所述目标中继终端设备的标识；另外所述第二信息中还可以包括目标小区的标识。
S1250：目标gNB向目标Relay UE发送携带第四信息的RRCReconfiguration message(RRC重配置消息)，所述第四信息用于指示所述目标Relay UE与所述Remote UE建立连接。
S1260：源gNB通过源Relay UE向Remote UE发送携带第二信息的RRCReconfiguration(RRC重配置)消息。
需要指出，上述S1250与S1260的执行顺序不分先后，可以先执行S1250再执行S1260；或者，可以先执行S1260再执行S1250；又或者，可以同时执行S1250以及S1260。
S1270：源gNB向源Relay UE发送携带第三信息的RRCReconfiguration(RRC重配置)消息；所述第三信息用于指示所述源中继终端设备释放与所述远端终端设备之间的连接。
S1280：Remote UE与目标Relay UE建立PC5连接。
S1290：Remote UE完成路径切换，通过目标Relay UE向目标gNB发送第五信息，所述第五信息由RRCReconfigurationComplete(RRC重配置完成)消息携带，用于表示所述远端终端设备完成路径切换。
以远端终端设备为Remote UE(用户设备，User Equipment)，目标中继终端设备为目标Relay(中继)UE，候选中继终端设备为候选Relay UE，源中继终端设备为源Relay UE，源网络设备为源NG-RAN，目标网络设备为目标NG-RAN为例，结合图13对前述第一方面、第二方面、第三方面实施例提供的切换方法进行再一种示例性说明，具体的：
S1301，Remote UE向源NG-RAN发送测量报告。
这里，Remote UE通过源NG-RAN与核心网设备(具体可以为UPF)进行上行和/或下行的用户面数据传输。
关于测量报告的相关说明与前述任意一示例相同，这里不做重复说明。
S1302，源NG-RAN向源AMF发送携带第一信息的切换需求(Handover Required)消息。
具体的，源NG-RAN基于测量报告确定目标NG-RAN以及目标NG-RAN下的候选Relay UE。源NG-RAN通过N2触发重分配决定(Decision to trigger a relocation via N2)时，源NG-RAN向源AMF发送携带第一信息的切换需求(Handover Required)。
本步骤中，所述第一信息中可以包括：目标NG-RAN(比如目标gNB)的ID，以及目标NG-RAN(比如目标gNB)下的候选Relay UE的ID。
另外，该第一信息中还可以包括target TAI等等，这里不做穷举。
S1303，源AMF选择目标AMF(T-AMF Selection)。
S1304，源AMF向目标AMF发送第一信息，该第一信息由Namf_Communication_CreateUEContext Request携带。
S1305，目标AMF向SMF发送Nsmf_PDUSession_UpdateSMContext Request。
S1306，SMF选择UPF(UPF Selection)。
S1307，SMF向PSA UPF发送N4会话修改请求(N4 Session Modification Request)。
S1308，PSA UPF向SMF发送N4会话修改响应(N4 Session Modification Response)。
S1309，SMF向目标UPF发送N4会话建立请求(N4 Session Establishment Request)。
S1310，目标UPF向SMF发送N4会话建立响应(N4 Session Establishment Response)。
S1311，SMF向目标AMF发送Nsmf_PDUSession_UpdateSMContext Response。
S1312，目标AMF与SMF之间进行PDU切换响应管理(PDU Handover Response supervision)。
S1313，目标AMF向目标NG-RAN发送携带第一信息的切换请求(Handover Request)。
本步骤中，目标NG-RAN基于第一信息确定目标Relay UE；另外，还可以选择目标小区。
进一步地，本步骤完成之后，目标NG-RAN可以基于所述目标Relay UE生成第二信息。
S1313a，目标NG-RAN向目标relay UE发送第四信息，该第四信息由RRC重分配消息携带，所述第四信息用于指示所述目标Relay UE与所述Remote UE建立连接。
S1314，目标NG-RAN向目标AMF发送携带第二信息的切换请求应答(Handover Request Acknowledge)。
S1315，目标AMF向SMF发送Nsmf_PDUSession_UpdateSMContext Request。
S1316，SMF向目标UPF发送N4会话修改请求。
S1317，目标UPF向SMF发送N4会话修改响应。
S1318，SMF向源UPF发送N4会话修改请求。
S1319，源UPF向SMF发送N4会话修改响应。
S1320，SMF向目标AMF发送Nsmf_PDUSession_UpdateSMContext Response。
S1321，目标AMF向源AMF发送第二信息，该第二信息由Namf_Communication_CreateUEContext Response携带。
S1322，源AMF向所述源NG-RAN发送携带所述第二信息的切换命令。
S1323，源NG-RAN向Remote UE发送所述第二信息，该第二信息可以由RRCReconfiguration(RRC重配置)消息携带。
S1324，Remote UE与目标Relay UE建立PC5连接。
S1325，Remote UE通过目标Relay UE向目标NG-RAN发送第五信息，所述第五信息由RRCReconfigurationComplete(RRC重配置完成)消息携带，用于表示所述远端终端设备完成路径切换。
图14是根据本申请一实施例的源网络设备的示意性框图。该源网络设备可以包括：
第一通信单元1401，用于向目标网络设备发送第一信息；所述第一信息用于确定目标中继终端设备；接收所述目标网络设备发送的第二信息，将所述第二信息发送至远端终端设备；所述第二信息用于指示所述远端终端设备切换为通过所述目标中继终端设备与所述目标网络设备连接。
所述第一信息，包括以下至少之一：
目标小区的标识；
所述目标小区内的所述目标中继终端设备的标识。
如图15所示，所述源网络设备还包括：
第一处理单元1402，用于基于测量报告，从候选小区中确定所述目标小区；基于所述测量报告，确定所述目标小区内的候选中继终端设备，从所述目标小区内的所述候选中继终端设备中确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
所述第一信息，包括以下至少之一：
目标小区的标识；
所述目标小区内的候选中继终端设备的标识；
所述目标小区内的候选中继终端设备的信号强度。
第一处理单元1402，用于基于测量报告，从候选小区中确定所述目标小区；基于所述测量报告，确定所述目标小区内的所述候选中继终端设备。
所述第一信息，包括以下至少之一：
目标网络设备的标识；
所述目标网络设备内的候选中继终端设备的标识；
所述目标网络设备内的候选中继终端设备的信号强度。
第一处理单元1402，用于基于测量报告，从候选小区中确定目标小区所在的目标网络设备；基于所述测量报告，确定所述目标网络设备内的所述候选中继终端设备。
所述第一通信单元1401，用于通过核心网设备向所述目标网络设备发送所述第一信息。
所述第一通信单元，用于通过核心网设备接收目标网络设备发送的所述第二信息。
所述第一通信单元，用于通过源中继终端设备将所述第二信息发送至所述远端终端设备。
所述第一通信单元，用于向所述源中继终端设备发送第三信息；所述第三信息用于指示所述源中继终端设备释放与所述远端终端设备之间的连接。
所述第一通信单元，用于接收所述远端终端设备发送的所述测量报告。
所述第一通信单元，用于接收所述远端终端设备通过源中继终端设备发送的所述测量报告。
所述测量报告包括以下至少之一：
所述候选中继终端设备的标识；
所述候选中继终端设备的信号强度；
所述候选中继终端设备所属的候选小区的标识；
所述候选中继终端设备所属的所述候选小区的信号强度。
所述第二信息中包括：所述目标中继终端设备的标识。
本申请实施例的源网络设备能够实现前述的第一方面、第二方面以及第三方面实施例中的源网络设备的对应功能。该源网络设备中的各个模块(子模块、单元或组件等)对应的流程、功能、实现方式以及有益效果，可参见上述方法实施例中的对应描述，在此不再赘述。需要说明，关于申请实施例的网络设备中的各个模块(子模块、单元或组件等)所描述的功能，可以由不同的模块(子模块、单元或组件等)实现，也可以由同一个模块(子模块、单元或组件等)实现。
图16是根据本申请一实施例的目标网络设备的示意性框图。该目标网络设备可以包括：
第二通信单元1601，用于接收源网络设备发送的第一信息；所述第一信息用于确定目标中继终端设备；向所述源网络设备发送第二信息；所述第二信息用于指示远端终端设备切换为通过所述目标中继终端设备与所述目标网络设备连接。
所述第一信息，包括以下至少之一：
目标小区的标识；
所述目标小区内的所述目标中继终端设备的标识。
如图17所示，所述目标网络设备还包括：
第二处理单元1602，用于基于所述第一信息，确定所述目标中继终端设备。
所述第一信息，包括以下至少之一：
目标小区的标识；
所述目标小区内的候选中继终端设备的标识；
所述目标小区内的候选中继终端设备的信号强度。
第二处理单元，用于基于所述第一信息确定所述目标小区内的候选中继终端设备；从所述目标小区内的候选中继终端设备中确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
所述第一信息，包括以下至少之一：
所述目标网络设备的标识；
所述目标网络设备内的候选中继终端设备的标识；
所述目标网络设备内的候选中继终端设备的信号强度。
第二处理单元，用于基于所述第一信息确定所述目标网络设备内的候选中继终端设备；从所述目标网络设备内的候选中继终端设备中，确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
所述第二通信单元，用于通过核心网设备接收所述源网络设备发送的所述第一信息。
所述第二通信单元，用于通过所述核心网设备向所述源网络设备发送第二信息。
所述第二信息包括：所述目标中继终端设备的标识。
所述第二通信单元，用于向所述目标中继终端设备发送第四信息；所述第四信息用于指示所述目标中继终端设备与所述远端终端设备建立连接。
所述第二通信单元，用于通过所述目标中继终端设备接收所述远端终端设备发送的第五信息；所述第五信息用于表示所述远端终端设备完成路径切换。
本申请实施例的目标网络设备能够实现前述的第一方面、第二方面以及第三方面实施例中的目标网络设备的对应功能。该目标网络设备中的各个模块(子模块、单元或组件等)对应的流程、功能、实现方式以及有益效果，可参见上述方法实施例中的对应描述，在此不再赘述。需要说明，关于申请实施例的目标网络设备中的各个模块(子模块、单元或组件等)所描述的功能，可以由不同的模块(子模块、单元或组件等)实现，也可以由同一个模块(子模块、单元或组件等)实现。
图18是根据本申请一实施例的远端终端设备的示意性框图。该目标网络设备可以包括：
第三通信单元1801，用于接收源网络设备发送的第二信息；所述第二信息用于指示远端终端设备切换为通过目标中继终端设备与目标网络设备连接。
所述第三通信单元，用于在所述远端终端设备与所述目标中继终端设备建立连接的情况下，通过所述目标中继终端设备，向所述目标网络设备发送第五信息，所述第五信息用于表示所述远端终端设备完成路径切换。
所述第三通信单元，用于向所述源网络设备发送测量报告。
所述第三通信单元，用于通过源中继终端设备，向所述源网络设备发送测量报告。
所述测量报告包括以下至少之一：
所述候选中继终端设备的标识，所述候选中继终端设备的信号强度，所述候选中继终端设备所属的候选小区的标识，所述候选中继终端设备所属的所述候选小区的信号强度。
所述第三通信单元，用于通过源中继终端设备，接收源网络设备发送的所述第二信息。
所述第二信息中包括：所述目标中继终端设备的标识。
需要指出的是，远端终端设备还可以包含第三处理单元，该第三处理单元可以执行生成测量报告、解析第二信息确定通信资源等等处理，只是这里不做穷举。
本申请实施例的远端终端设备能够实现前述的第一方面、第二方面以及第三方面实施例中的远端终端设备的对应功能。该远端终端设备中的各个模块(子模块、单元或组件等)对应的流程、功能、实现方式以及有益效果，可参见上述方法实施例中的对应描述，在此不再赘述。需要说明，关于申请实施例的远端终端设备中的各个模块(子模块、单元或组件等)所描述的功能，可以由不同的模块(子模块、单元或组件等)实现，也可以由同一个模块(子模块、单元或组件等)实现。
图19是根据本申请实施例的通信设备1900示意性结构图。该通信设备1900包括处理器1910，处理器1910可以从存储器中调用并运行计算机程序，以使通信设备1900实现本申请实施例中的方法。
在一种可能的实现方式中，通信设备1900还可以包括存储器1920。其中，处理器1910可以从存储器1920中调用并运行计算机程序，以使通信设备1900实现本申请实施例中的方法。
其中，存储器1920可以是独立于处理器1910的一个单独的器件，也可以集成在处理器1910中。
在一种可能的实现方式中，通信设备1900还可以包括收发器1930，处理器1910可以控制该收发器1930与其他设备进行通信，具体地，可以向其他设备发送信息或数据，或接收其他设备发送的信息或数据。
其中，收发器1930可以包括发射机和接收机。收发器1930还可以进一步包括天线，天线的数量可以为一个或多个。
在一种可能的实现方式中，该通信设备1900可为本申请实施例的网络设备，并且该通信设备1900可以实现本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
在一种可能的实现方式中，该通信设备1900可为本申请实施例的终端设备，并且该通信设备1900可以实现本申请实施例的各个方法中由终端设备实现的相应流程，为了简洁，在此不再赘述。
图20是根据本申请实施例的芯片2000的示意性结构图。该芯片2000包括处理器2010，处理器2010可以从存储器中调用并运行计算机程序，以实现本申请实施例中的方法。
在一种可能的实现方式中，芯片2000还可以包括存储器2020。其中，处理器2010可以从存储器2020中调用并运行计算机程序，以实现本申请实施例中由终端设备或者网络设备执行的方法。
其中，存储器2020可以是独立于处理器2010的一个单独的器件，也可以集成在处理器2010中。
在一种可能的实现方式中，该芯片2000还可以包括输入接口2030。其中，处理器2010可以控制该输入接口2030与其他设备或芯片进行通信，具体地，可以获取其他设备或芯片发送的信息或数据。
在一种可能的实现方式中，该芯片2000还可以包括输出接口2040。其中，处理器2010可以控制该输出接口2040与其他设备或芯片进行通信，具体地，可以向其他设备或芯片输出信息或数据。
在一种可能的实现方式中，该芯片可应用于本申请实施例中的网络设备，并且该芯片可以实现本申请实施例的各个方法中由网络设备实现的相应流程，为了简洁，在此不再赘述。
在一种可能的实现方式中，该芯片可应用于本申请实施例中的终端设备，并且该芯片可以实现本申请实施例的各个方法中由终端设备实现的相应流程，为了简洁，在此不再赘述。
应用于网络设备和终端设备的芯片可以是相同的芯片或不同的芯片。
应理解，本申请实施例提到的芯片还可以称为系统级芯片，系统芯片，芯片系统或片上系统芯片等。
上述提及的处理器可以是通用处理器、数字信号处理器(digital signal processor，DSP)、现成可编程门阵列(field programmable gate array，FPGA)、专用集成电路(application specific integrated circuit，ASIC)或者其他可编程逻辑器件、晶体管逻辑器件、分立硬件组件等。其中，上述提到的通用处理器可以是微处理器或者也可以是任何常规的处理器等。
上述提及的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)。
应理解，上述存储器为示例性但不是限制性说明，例如，本申请实施例中的存储器还可以是静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synch link DRAM，SLDRAM)以及直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)等等。也就是说，本申请实施例中的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
图21是根据本申请实施例的通信系统2100的示意性框图。该通信系统2100包括终端设备2110和网络设备2120。
其中，该终端设备2110可以用于实现上述方法中由终端设备实现的相应的功能，以及该网络设备2120可以用于实现上述方法中由网络设备实现的相应的功能。为了简洁，在此不再赘述。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行该计算机程序指令时，全部或部分地产生按照本申请实施例中的流程或功能。该计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。该计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，该计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(Digital Subscriber Line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。该计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。该可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘(Solid State Disk，SSD))等。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
以上所述仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以该权利要求的保护范围为准。

Claims (78)

  1. 一种切换方法，包括：
    源网络设备向目标网络设备发送第一信息；所述第一信息用于确定目标中继终端设备；
    所述源网络设备接收所述目标网络设备发送的第二信息，将所述第二信息发送至远端终端设备；所述第二信息用于指示所述远端终端设备切换为通过所述目标中继终端设备与所述目标网络设备连接。
  2. 根据权利要求1所述的方法，其中，所述第一信息，包括以下至少之一：
    目标小区的标识；
    所述目标小区内的所述目标中继终端设备的标识。
  3. 根据权利要求2所述的方法，其中，所述方法还包括：
    所述源网络设备基于测量报告，从候选小区中确定所述目标小区；
    所述源网络设备基于所述测量报告，确定所述目标小区内的候选中继终端设备，从所述目标小区内的所述候选中继终端设备中确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
  4. 根据权利要求1所述的方法，其中，所述第一信息，包括以下至少之一：
    目标小区的标识；
    所述目标小区内的候选中继终端设备的标识；
    所述目标小区内的候选中继终端设备的信号强度。
  5. 根据权利要求4所述的方法，其中，所述方法还包括：
    所述源网络设备基于测量报告，从候选小区中确定所述目标小区；所述源网络设备基于所述测量报告，确定所述目标小区内的所述候选中继终端设备。
  6. 根据权利要求1所述的方法，其中，所述第一信息，包括以下至少之一：
    目标网络设备的标识；
    所述目标网络设备内的候选中继终端设备的标识；
    所述目标网络设备内的候选中继终端设备的信号强度。
  7. 根据权利要求6所述的方法，其中，所述方法还包括：
    所述源网络设备基于测量报告，从候选小区中确定目标小区所在的目标网络设备；所述源网络设备基于所述测量报告，确定所述目标网络设备内的所述候选中继终端设备。
  8. 根据权利要求1-7任一项所述的方法，其中，所述源网络设备向目标网络设备发送第一信息，包括：
    所述源网络设备通过核心网设备向所述目标网络设备发送所述第一信息。
  9. 根据权利要求8所述的方法，其中，所述源网络设备接收所述目标网络设备发送的所述第二信息，包括：
    所述源网络设备通过核心网设备接收目标网络设备发送的所述第二信息。
  10. 根据权利要求1-9任一项所述的方法，其中，所述将所述第二信息发送至远端终端设备，包括：
    所述源网络设备通过源中继终端设备将所述第二信息发送至所述远端终端设备。
  11. 根据权利要求10所述的方法，其中，所述方法还包括：
    所述源网络设备向所述源中继终端设备发送第三信息；所述第三信息用于指示所述源中继终端设备释放与所述远端终端设备之间的连接。
  12. 根据权利要求1-11任一项所述的方法，其中，所述方法还包括：
    所述源网络设备接收所述远端终端设备发送的所述测量报告。
  13. 根据权利要求12所述的方法，其中，所述源网络设备接收所述远端终端设备发送的所述测量报告，包括：
    所述源网络设备接收所述远端终端设备通过源中继终端设备发送的所述测量报告。
  14. 根据权利要求3、5、7、12、13任一项所述的方法，其中，所述测量报告包括以下至少之一：
    所述候选中继终端设备的标识；
    所述候选中继终端设备的信号强度；
    所述候选中继终端设备所属的候选小区的标识；
    所述候选中继终端设备所属的所述候选小区的信号强度。
  15. 根据权利要求1-14任一项所述的方法，其中，所述第二信息中包括：所述目标中继终端设备的标识。
  16. 一种切换方法，包括：
    目标网络设备接收源网络设备发送的第一信息；所述第一信息用于确定目标中继终端设备；
    所述目标网络设备向所述源网络设备发送第二信息；所述第二信息用于指示远端终端设备切换为通过所述目标中继终端设备与所述目标网络设备连接。
  17. 根据权利要求16所述的方法，其中，所述第一信息，包括以下至少之一：
    目标小区的标识；
    所述目标小区内的所述目标中继终端设备的标识。
  18. 根据权利要求17所述的方法，其中，所述方法还包括：
    所述目标网络设备基于所述第一信息，确定所述目标中继终端设备。
  19. 根据权利要求16所述的方法，其中，所述第一信息，包括以下至少之一：
    目标小区的标识；
    所述目标小区内的候选中继终端设备的标识；
    所述目标小区内的候选中继终端设备的信号强度。
  20. 根据权利要求19所述的方法，其中，所述方法还包括：
    所述目标网络设备基于所述第一信息确定所述目标小区内的候选中继终端设备；从所述目标小区内的候选中继终端设备中确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
  21. 根据权利要求16所述的方法，其中，所述第一信息，包括以下至少之一：
    所述目标网络设备的标识；
    所述目标网络设备内的候选中继终端设备的标识；
    所述目标网络设备内的候选中继终端设备的信号强度。
  22. 根据权利要求21所述的方法，其中，所述方法还包括：
    所述目标网络设备基于所述第一信息确定所述目标网络设备内的候选中继终端设备；从所述目标网络设备内的候选中继终端设备中，确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
  23. 根据权利要求16-22任一项所述的方法，其中，所述目标网络设备接收源网络设备发送的第一信息，包括：
    所述目标网络设备通过核心网设备接收所述源网络设备发送的所述第一信息。
  24. 根据权利要求23所述的方法，其中，所述目标网络设备向所述源网络设备发送第二信息，包括：
    所述目标网络设备通过所述核心网设备向所述源网络设备发送第二信息。
  25. 根据权利要求16-24任一项所述的方法，其中，所述第二信息包括：所述目标中继终端设备的标识。
  26. 根据权利要求16-25任一项所述的方法，其中，所述方法还包括：
    所述目标网络设备向所述目标中继终端设备发送第四信息；所述第四信息用于指示所述目标中继终端设备与所述远端终端设备建立连接。
  27. 根据权利要求16-26任一项所述的方法，其中，所述方法还包括：
    所述目标网络设备通过所述目标中继终端设备接收所述远端终端设备发送的第五信息；所述第五信息用于表示所述远端终端设备完成路径切换。
  28. 一种切换方法，包括：
    远端终端设备接收源网络设备发送的第二信息；所述第二信息用于指示远端终端设备切换为通过目标中继终端设备与目标网络设备连接。
  29. 根据权利要求28所述的方法，其中，所述方法还包括：
    在所述远端终端设备与所述目标中继终端设备建立连接的情况下，所述远端终端设备通过所述目标中继终端设备，向所述目标网络设备发送第五信息，所述第五信息用于表示所述远端终端设备完成路径切换。
  30. 根据权利要求28或29所述的方法，其中，所述方法还包括：
    所述远端终端设备向所述源网络设备发送测量报告。
  31. 根据权利要求30所述的方法，其中，所述远端终端设备向所述源网络设备发送测量报告，包括：
    所述远端终端设备通过源中继终端设备，向所述源网络设备发送测量报告。
  32. 根据权利要求30或31任一项所述的方法，其中，所述测量报告包括以下至少之一：
    所述候选中继终端设备的标识，所述候选中继终端设备的信号强度，所述候选中继终端设备所属 的候选小区的标识，所述候选中继终端设备所属的所述候选小区的信号强度。
  33. 根据权利要求28-32任一项所述的方法，其中，所述远端终端设备接收源网络设备发送的第二信息，包括：
    所述远端终端设备通过源中继终端设备，接收源网络设备发送的所述第二信息。
  34. 根据权利要求28-33任一项所述的方法，其中，所述第二信息中包括：所述目标中继终端设备的标识。
  35. 一种源网络设备，包括：
    第一通信单元，用于向目标网络设备发送第一信息；所述第一信息用于确定目标中继终端设备；接收所述目标网络设备发送的第二信息，将所述第二信息发送至远端终端设备；所述第二信息用于指示所述远端终端设备切换为通过所述目标中继终端设备与所述目标网络设备连接。
  36. 根据权利要求35所述的源网络设备，其中，所述第一信息，包括以下至少之一：
    目标小区的标识；
    所述目标小区内的所述目标中继终端设备的标识。
  37. 根据权利要求36所述的源网络设备，其中，所述源网络设备还包括：
    第一处理单元，用于基于测量报告，从候选小区中确定所述目标小区；基于所述测量报告，确定所述目标小区内的候选中继终端设备，从所述目标小区内的所述候选中继终端设备中确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
  38. 根据权利要求35所述的源网络设备，其中，所述第一信息，包括以下至少之一：
    目标小区的标识；
    所述目标小区内的候选中继终端设备的标识；
    所述目标小区内的候选中继终端设备的信号强度。
  39. 根据权利要求38所述的源网络设备，其中，所述源网络设备还包括：
    第一处理单元，用于基于测量报告，从候选小区中确定所述目标小区；基于所述测量报告，确定所述目标小区内的所述候选中继终端设备。
  40. 根据权利要求35所述的源网络设备，其中，所述第一信息，包括以下至少之一：
    目标网络设备的标识；
    所述目标网络设备内的候选中继终端设备的标识；
    所述目标网络设备内的候选中继终端设备的信号强度。
  41. 根据权利要求40所述的源网络设备，其中，所述源网络设备还包括：
    第一处理单元，用于基于测量报告，从候选小区中确定目标小区所在的目标网络设备；基于所述测量报告，确定所述目标网络设备内的所述候选中继终端设备。
  42. 根据权利要求35-41任一项所述的源网络设备，其中，所述第一通信单元，用于通过核心网设备向所述目标网络设备发送所述第一信息。
  43. 根据权利要求42所述的源网络设备，其中，所述第一通信单元，用于通过核心网设备接收目标网络设备发送的所述第二信息。
  44. 根据权利要求35-43任一项所述的源网络设备，其中，所述第一通信单元，用于通过源中继终端设备将所述第二信息发送至所述远端终端设备。
  45. 根据权利要求44所述的源网络设备，其中，所述第一通信单元，用于向所述源中继终端设备发送第三信息；所述第三信息用于指示所述源中继终端设备释放与所述远端终端设备之间的连接。
  46. 根据权利要求35-45任一项所述的源网络设备，其中，所述第一通信单元，用于接收所述远端终端设备发送的所述测量报告。
  47. 根据权利要求46所述的源网络设备，其中，所述第一通信单元，用于接收所述远端终端设备通过源中继终端设备发送的所述测量报告。
  48. 根据权利要求37、39、41、46、47任一项所述的源网络设备，其中，所述测量报告包括以下至少之一：
    所述候选中继终端设备的标识；
    所述候选中继终端设备的信号强度；
    所述候选中继终端设备所属的候选小区的标识；
    所述候选中继终端设备所属的所述候选小区的信号强度。
  49. 根据权利要求35-48任一项所述的源网络设备，其中，所述第二信息中包括：所述目标中继终端设备的标识。
  50. 一种目标网络设备，包括：
    第二通信单元，用于接收源网络设备发送的第一信息；所述第一信息用于确定目标中继终端设备；向所述源网络设备发送第二信息；所述第二信息用于指示远端终端设备切换为通过所述目标中继终端设备与所述目标网络设备连接。
  51. 根据权利要求50所述的目标网络设备，其中，所述第一信息，包括以下至少之一：
    目标小区的标识；
    所述目标小区内的所述目标中继终端设备的标识。
  52. 根据权利要求51所述的目标网络设备，其中，所述目标网络设备还包括：
    第二处理单元，用于基于所述第一信息，确定所述目标中继终端设备。
  53. 根据权利要求50所述的目标网络设备，其中，所述第一信息，包括以下至少之一：
    目标小区的标识；
    所述目标小区内的候选中继终端设备的标识；
    所述目标小区内的候选中继终端设备的信号强度。
  54. 根据权利要求53所述的目标网络设备，其中，所述目标网络设备还包括：
    第二处理单元，用于基于所述第一信息确定所述目标小区内的候选中继终端设备；从所述目标小区内的候选中继终端设备中确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
  55. 根据权利要求50所述的目标网络设备，其中，所述第一信息，包括以下至少之一：
    所述目标网络设备的标识；
    所述目标网络设备内的候选中继终端设备的标识；
    所述目标网络设备内的候选中继终端设备的信号强度。
  56. 根据权利要求55所述的目标网络设备，其中，所述目标网络设备还包括：
    第二处理单元，用于基于所述第一信息确定所述目标网络设备内的候选中继终端设备；从所述目标网络设备内的候选中继终端设备中，确定满足预设条件的所述目标中继终端设备；其中，所述预设条件包括以下至少之一：负荷最小、信号强度最大。
  57. 根据权利要求50-56任一项所述的目标网络设备，其中，所述第二通信单元，用于通过核心网设备接收所述源网络设备发送的所述第一信息。
  58. 根据权利要求57所述的目标网络设备，其中，所述第二通信单元，用于通过所述核心网设备向所述源网络设备发送第二信息。
  59. 根据权利要求50-58任一项所述的目标网络设备，其中，所述第二信息包括：所述目标中继终端设备的标识。
  60. 根据权利要求50-59任一项所述的目标网络设备，其中，所述第二通信单元，用于向所述目标中继终端设备发送第四信息；所述第四信息用于指示所述目标中继终端设备与所述远端终端设备建立连接。
  61. 根据权利要求50-60任一项所述的目标网络设备，其中，所述第二通信单元，用于通过所述目标中继终端设备接收所述远端终端设备发送的第五信息；所述第五信息用于表示所述远端终端设备完成路径切换。
  62. 一种远端终端设备，包括：
    第三通信单元，用于接收源网络设备发送的第二信息；所述第二信息用于指示远端终端设备切换为通过目标中继终端设备与目标网络设备连接。
  63. 根据权利要求62所述的远端终端设备，其中，所述第三通信单元，用于在所述远端终端设备与所述目标中继终端设备建立连接的情况下，通过所述目标中继终端设备，向所述目标网络设备发送第五信息，所述第五信息用于表示所述远端终端设备完成路径切换。
  64. 根据权利要求62或63所述的远端终端设备，其中，所述第三通信单元，用于向所述源网络设备发送测量报告。
  65. 根据权利要求64所述的远端终端设备，其中，所述第三通信单元，用于通过源中继终端设备，向所述源网络设备发送测量报告。
  66. 根据权利要求64或65任一项所述的远端终端设备，其中，所述测量报告包括以下至少之一：
    所述候选中继终端设备的标识，所述候选中继终端设备的信号强度，所述候选中继终端设备所属的候选小区的标识，所述候选中继终端设备所属的所述候选小区的信号强度。
  67. 根据权利要求62-66任一项所述的远端终端设备，其中，所述第三通信单元，用于通过源中继终端设备，接收源网络设备发送的所述第二信息。
  68. 根据权利要求62-67任一项所述的远端终端设备，其中，所述第二信息中包括：所述目标中继 终端设备的标识。
  69. 一种网络设备，包括：处理器和存储器，该存储器用于存储计算机程序，所述处理器用于调用并运行所述存储器中存储的计算机程序，以使所述终端设备执行如权利要求1至15或16-27中任一项所述的方法。
  70. 一种终端设备，包括：处理器和存储器，该存储器用于存储计算机程序，所述处理器用于调用并运行所述存储器中存储的计算机程序，以使所述终端设备执行如权利要求28至34中任一项所述的方法。
  71. 一种芯片，包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有所述芯片的设备执行如权利要求1至15或16-27中任一项所述的方法。
  72. 一种芯片，包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有所述芯片的设备执行如权利要求28至34中任一项所述的方法。
  73. 一种计算机可读存储介质，用于存储计算机程序，当所述计算机程序被设备运行时使得所述设备执行如权利要求1至15或16-27中任一项所述的方法。
  74. 一种计算机可读存储介质，用于存储计算机程序，当所述计算机程序被设备运行时使得所述设备执行如权利要求28至34中任一项所述的方法。
  75. 一种计算机程序产品，包括计算机程序指令，该计算机程序指令使得计算机执行如权利要求1至15或16-27中任一项所述的方法。
  76. 一种计算机程序产品，包括计算机程序指令，该计算机程序指令使得计算机执行如权利要求28至34中任一项所述的方法。
  77. 一种计算机程序，所述计算机程序使得计算机执行如权利要求1至15或16-27中任一项所述的方法。
  78. 一种计算机程序，所述计算机程序使得计算机执行如权利要求28至34中任一项所述的方法。
PCT/CN2022/075699 2022-02-09 2022-02-09 切换方法、终端设备和网络设备 WO2023150944A1 (zh)

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